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PD/!Spr2Jpeg/Documents/Help
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Archimedes World » AW-1995-07-Disc2.adf » AW0795_2 |
| Filename: | PD/!Spr2Jpeg/Documents/Help |
| Read OK: | ✔ |
| File size: | 17DE bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
Help for Sprite 2 Jpeg
======================
Sprite 2 Jpeg is an image converter, which allows you to convert sprites to Jpegs, and back again. It also accepts and outputs Clear files, GIFs, Targas, and it can handle deep sprites (24-bit colour). Note that for this last option, you need a version of ChangeFSI that can handle them.
Basically, S2J is an unholy matrimony between the purity of ChangeFSI and the foul, dank wretchedness of my code. So to run S2J, you'll need to have opened a directory containing ChangeFSI, though not necessarily run it. Done that ? Right.
Uh... what now ?
You can: drag an image file onto S2J, and see what happens, or examine the options. I'm going to go over the options first
here, but don't let that hold you back. Click on the iconbar-icon to open the options window, or select 'Options...' from the menu. Inside it is a scrolling list of options, which can be saved, OKed, or Canceled if you've changed your mind. But before I go through the options, I'll explain a little about the various types of image file, and how they work.
First, we have Sprites, which are the standard on the Arc. They have the advantage that everyone can read them, but this isn't always true, because there are three main varieties: old ones, which everyone can read, Risc OS 3.1 ones which sometimes can't be read on machines without Risc OS 3.1, and new ones, for people with Risc OS 3.5, which support 24-bit colour. CC have also got their own formats, but no one uses them (unless maybe you've got a ColourCard).
Then, there are Clear files. These are easy to use from a programmer's perspective, and there is only one Clear standard, so they really are pretty standard. Useful for using full colour images on old machines. They're almost identical to a similar format on other platforms, Portable BitMaps, or PBMs.
Jpeg files: these contain, almost always, real-world images (ie. scanned, digitised, whatever), in full (24-bit) colour. This normally takes up a lot of disc space (a 768 x 512, full colour Clear file could easily take up over 1.5 Mb. However, the identical Jpeg file is cunningly compressed: first, information that is so subtle it's invisble to the human eye is removed. Then, it's compressed, which means it takes as little as 25-100k or so - that's a reduction to about 2% of its original size. Because Jpeg allows you to choose the quality of the final image, balancing it against file size, this means it's well good.
GIFs are 256 colour, non-lossy compressed images from the PC world. The compression is only around 50% or so, and they're not very good for quality work.
Targas, well I have no idea of anyone who uses these. They are currently unsupported, but they might be soon (which is why the option is there. You can compress them into Jpegs, though (you just can't decompress into them).
Right, the options: they divide into the compression options, for compressing an image into a Jpeg, and the decompression options (if you can't work out what that is, then I'm not going to tell you). From top to bottom:
Quality: From 0 (ultra low quality / tiny files) to 100 (no picture loss, anti-compression). About 75 is recommended, but if you just want a low quality thumbnail, you can easily go as low as 40. A quite interesting thing to do is reduce it to about 3, which will give a very odd image, which can't be recognised normally, then squint at it, and it's quite incredible the amount of detail your brain can fill in. Wierd.
Optimise file size: at the expense of compression times, reduce this file size. This does not affect quality at all.
Debug: nothing, but it's there for completeness
Extra: you can fill in command line options here (ie. -q 100), but all the ones currently implemented are available as buttons anyway. It's basically for future versions of the compressor. I'd leave it alone, cause it don't do nothing much yet.
Non-interleaved: not implemented in the compressor yet.
Arithmetic coding: not implemented, and not likely - it requires a whacking great license fee
And the decompression options:
Quantize: reduce the number of colours down to amount specified by you. My advice is to do this in ChangeFSI - output to Clear or 24-bit sprite, then choose the number of colours you want in ChangeFSI. Max value is 256, min 8. Again, it's not much use.
1 pass quantization: use one pass quantization. Needs less memory, and is faster, but produces a lower quality image.
Grey-scale: produces a grey-scale image
Cross-block smoothing: improves the image at very low quality settings (10 - 20), but may make it worse at higher settings.
Debug: as above
Extra: as above
So: to make / unmake a Jpeg file, drag an image file onto the iconbar icon. If it's not a Jpeg, then S2J will recognise a few formats, and try it's hardest with most others; there are very few formats it won't work with. If it is, then it will decompress, and...
The save window will open. You can select the file-type to save if you dragged in a Jpeg; if not, you can only ouput Jpegs. The choices are: Jpeg, Clear, Sprite, 24-bit sprite, GIF and Targa. Save it in the normal Risc OS manner.
Well, that's pretty much it. Send fan mail / credit cards / money / letters / PD / letterbombs / no, not letterbombs - sorry, as you were / sugestions / bug reports / anything (except letterbombs) to:
The Intelligent Stoat, c/o
David Rodgman
Laurel Farm
Upper Strode
Winford
Bristol
BS18 8BG
Oh yeah, I ought to thank the Independant JPEG Group here, for their JPEG compressor / decompressor. Thanks also to: Doggysoft (for the WimpExtension module), me, Dave McCartney of the Datafile. This software is based in part on the work of the Independent JPEG Group. But they aren't responsible for what may happen to your hard disc after running this. And neither am I, for that matter.
I probably ought to say: "The Graphics Interchange Format(c) is the Copyright property of CompuServe Incorporated. GIF(sm) is a Service Mark property of CompuServe Incorporated." as well here, but I don't feel like it, so I won't. 00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000010 20 20 20 20 20 20 20 20 20 48 65 6c 70 20 66 6f | Help fo| 00000020 72 20 53 70 72 69 74 65 20 32 20 4a 70 65 67 0a |r Sprite 2 Jpeg.| 00000030 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000040 20 20 20 20 20 20 20 20 20 3d 3d 3d 3d 3d 3d 3d | =======| 00000050 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 0a |===============.| 00000060 0a 53 70 72 69 74 65 20 32 20 4a 70 65 67 20 69 |.Sprite 2 Jpeg i| 00000070 73 20 61 6e 20 69 6d 61 67 65 20 63 6f 6e 76 65 |s an image conve| 00000080 72 74 65 72 2c 20 77 68 69 63 68 20 61 6c 6c 6f |rter, which allo| 00000090 77 73 20 79 6f 75 20 74 6f 20 63 6f 6e 76 65 72 |ws you to conver| 000000a0 74 20 73 70 72 69 74 65 73 20 74 6f 20 4a 70 65 |t sprites to Jpe| 000000b0 67 73 2c 20 61 6e 64 20 62 61 63 6b 20 61 67 61 |gs, and back aga| 000000c0 69 6e 2e 20 49 74 20 61 6c 73 6f 20 61 63 63 65 |in. It also acce| 000000d0 70 74 73 20 61 6e 64 20 6f 75 74 70 75 74 73 20 |pts and outputs | 000000e0 43 6c 65 61 72 20 66 69 6c 65 73 2c 20 47 49 46 |Clear files, GIF| 000000f0 73 2c 20 54 61 72 67 61 73 2c 20 61 6e 64 20 69 |s, Targas, and i| 00000100 74 20 63 61 6e 20 68 61 6e 64 6c 65 20 64 65 65 |t can handle dee| 00000110 70 20 73 70 72 69 74 65 73 20 28 32 34 2d 62 69 |p sprites (24-bi| 00000120 74 20 63 6f 6c 6f 75 72 29 2e 20 4e 6f 74 65 20 |t colour). Note | 00000130 74 68 61 74 20 66 6f 72 20 74 68 69 73 20 6c 61 |that for this la| 00000140 73 74 20 6f 70 74 69 6f 6e 2c 20 79 6f 75 20 6e |st option, you n| 00000150 65 65 64 20 61 20 76 65 72 73 69 6f 6e 20 6f 66 |eed a version of| 00000160 20 43 68 61 6e 67 65 46 53 49 20 74 68 61 74 20 | ChangeFSI that | 00000170 63 61 6e 20 68 61 6e 64 6c 65 20 74 68 65 6d 2e |can handle them.| 00000180 0a 0a 42 61 73 69 63 61 6c 6c 79 2c 20 53 32 4a |..Basically, S2J| 00000190 20 69 73 20 61 6e 20 75 6e 68 6f 6c 79 20 6d 61 | is an unholy ma| 000001a0 74 72 69 6d 6f 6e 79 20 62 65 74 77 65 65 6e 20 |trimony between | 000001b0 74 68 65 20 70 75 72 69 74 79 20 6f 66 20 43 68 |the purity of Ch| 000001c0 61 6e 67 65 46 53 49 20 61 6e 64 20 74 68 65 20 |angeFSI and the | 000001d0 66 6f 75 6c 2c 20 64 61 6e 6b 20 77 72 65 74 63 |foul, dank wretc| 000001e0 68 65 64 6e 65 73 73 20 6f 66 20 6d 79 20 63 6f |hedness of my co| 000001f0 64 65 2e 20 53 6f 20 74 6f 20 72 75 6e 20 53 32 |de. So to run S2| 00000200 4a 2c 20 79 6f 75 27 6c 6c 20 6e 65 65 64 20 74 |J, you'll need t| 00000210 6f 20 68 61 76 65 20 6f 70 65 6e 65 64 20 61 20 |o have opened a | 00000220 64 69 72 65 63 74 6f 72 79 20 63 6f 6e 74 61 69 |directory contai| 00000230 6e 69 6e 67 20 43 68 61 6e 67 65 46 53 49 2c 20 |ning ChangeFSI, | 00000240 74 68 6f 75 67 68 20 6e 6f 74 20 6e 65 63 65 73 |though not neces| 00000250 73 61 72 69 6c 79 20 72 75 6e 20 69 74 2e 20 44 |sarily run it. D| 00000260 6f 6e 65 20 74 68 61 74 20 3f 20 52 69 67 68 74 |one that ? Right| 00000270 2e 0a 0a 55 68 2e 2e 2e 20 77 68 61 74 20 6e 6f |...Uh... what no| 00000280 77 20 3f 0a 0a 59 6f 75 20 63 61 6e 3a 20 64 72 |w ?..You can: dr| 00000290 61 67 20 61 6e 20 69 6d 61 67 65 20 66 69 6c 65 |ag an image file| 000002a0 20 6f 6e 74 6f 20 53 32 4a 2c 20 61 6e 64 20 73 | onto S2J, and s| 000002b0 65 65 20 77 68 61 74 20 68 61 70 70 65 6e 73 2c |ee what happens,| 000002c0 20 6f 72 20 65 78 61 6d 69 6e 65 20 74 68 65 20 | or examine the | 000002d0 6f 70 74 69 6f 6e 73 2e 20 49 27 6d 20 67 6f 69 |options. I'm goi| 000002e0 6e 67 20 74 6f 20 67 6f 20 6f 76 65 72 20 74 68 |ng to go over th| 000002f0 65 20 6f 70 74 69 6f 6e 73 20 66 69 72 73 74 0a |e options first.| 00000300 68 65 72 65 2c 20 62 75 74 20 64 6f 6e 27 74 20 |here, but don't | 00000310 6c 65 74 20 74 68 61 74 20 68 6f 6c 64 20 79 6f |let that hold yo| 00000320 75 20 62 61 63 6b 2e 20 43 6c 69 63 6b 20 6f 6e |u back. Click on| 00000330 20 74 68 65 20 69 63 6f 6e 62 61 72 2d 69 63 6f | the iconbar-ico| 00000340 6e 20 74 6f 20 6f 70 65 6e 20 74 68 65 20 6f 70 |n to open the op| 00000350 74 69 6f 6e 73 20 77 69 6e 64 6f 77 2c 20 6f 72 |tions window, or| 00000360 20 73 65 6c 65 63 74 20 27 4f 70 74 69 6f 6e 73 | select 'Options| 00000370 2e 2e 2e 27 20 66 72 6f 6d 20 74 68 65 20 6d 65 |...' from the me| 00000380 6e 75 2e 20 49 6e 73 69 64 65 20 69 74 20 69 73 |nu. Inside it is| 00000390 20 61 20 73 63 72 6f 6c 6c 69 6e 67 20 6c 69 73 | a scrolling lis| 000003a0 74 20 6f 66 20 6f 70 74 69 6f 6e 73 2c 20 77 68 |t of options, wh| 000003b0 69 63 68 20 63 61 6e 20 62 65 20 73 61 76 65 64 |ich can be saved| 000003c0 2c 20 4f 4b 65 64 2c 20 6f 72 20 43 61 6e 63 65 |, OKed, or Cance| 000003d0 6c 65 64 20 69 66 20 79 6f 75 27 76 65 20 63 68 |led if you've ch| 000003e0 61 6e 67 65 64 20 79 6f 75 72 20 6d 69 6e 64 2e |anged your mind.| 000003f0 20 42 75 74 20 62 65 66 6f 72 65 20 49 20 67 6f | But before I go| 00000400 20 74 68 72 6f 75 67 68 20 74 68 65 20 6f 70 74 | through the opt| 00000410 69 6f 6e 73 2c 20 49 27 6c 6c 20 65 78 70 6c 61 |ions, I'll expla| 00000420 69 6e 20 61 20 6c 69 74 74 6c 65 20 61 62 6f 75 |in a little abou| 00000430 74 20 74 68 65 20 76 61 72 69 6f 75 73 20 74 79 |t the various ty| 00000440 70 65 73 20 6f 66 20 69 6d 61 67 65 20 66 69 6c |pes of image fil| 00000450 65 2c 20 61 6e 64 20 68 6f 77 20 74 68 65 79 20 |e, and how they | 00000460 77 6f 72 6b 2e 0a 0a 46 69 72 73 74 2c 20 77 65 |work...First, we| 00000470 20 68 61 76 65 20 53 70 72 69 74 65 73 2c 20 77 | have Sprites, w| 00000480 68 69 63 68 20 61 72 65 20 74 68 65 20 73 74 61 |hich are the sta| 00000490 6e 64 61 72 64 20 6f 6e 20 74 68 65 20 41 72 63 |ndard on the Arc| 000004a0 2e 20 54 68 65 79 20 68 61 76 65 20 74 68 65 20 |. They have the | 000004b0 61 64 76 61 6e 74 61 67 65 20 74 68 61 74 20 65 |advantage that e| 000004c0 76 65 72 79 6f 6e 65 20 63 61 6e 20 72 65 61 64 |veryone can read| 000004d0 20 74 68 65 6d 2c 20 62 75 74 20 74 68 69 73 20 | them, but this | 000004e0 69 73 6e 27 74 20 61 6c 77 61 79 73 20 74 72 75 |isn't always tru| 000004f0 65 2c 20 62 65 63 61 75 73 65 20 74 68 65 72 65 |e, because there| 00000500 20 61 72 65 20 74 68 72 65 65 20 6d 61 69 6e 20 | are three main | 00000510 76 61 72 69 65 74 69 65 73 3a 20 6f 6c 64 20 6f |varieties: old o| 00000520 6e 65 73 2c 20 77 68 69 63 68 20 65 76 65 72 79 |nes, which every| 00000530 6f 6e 65 20 63 61 6e 20 72 65 61 64 2c 20 52 69 |one can read, Ri| 00000540 73 63 20 4f 53 20 33 2e 31 20 6f 6e 65 73 20 77 |sc OS 3.1 ones w| 00000550 68 69 63 68 20 73 6f 6d 65 74 69 6d 65 73 20 63 |hich sometimes c| 00000560 61 6e 27 74 20 62 65 20 72 65 61 64 20 6f 6e 20 |an't be read on | 00000570 6d 61 63 68 69 6e 65 73 20 77 69 74 68 6f 75 74 |machines without| 00000580 20 52 69 73 63 20 4f 53 20 33 2e 31 2c 20 61 6e | Risc OS 3.1, an| 00000590 64 20 6e 65 77 20 6f 6e 65 73 2c 20 66 6f 72 20 |d new ones, for | 000005a0 70 65 6f 70 6c 65 20 77 69 74 68 20 52 69 73 63 |people with Risc| 000005b0 20 4f 53 20 33 2e 35 2c 20 77 68 69 63 68 20 73 | OS 3.5, which s| 000005c0 75 70 70 6f 72 74 20 32 34 2d 62 69 74 20 63 6f |upport 24-bit co| 000005d0 6c 6f 75 72 2e 20 43 43 20 68 61 76 65 20 61 6c |lour. CC have al| 000005e0 73 6f 20 67 6f 74 20 74 68 65 69 72 20 6f 77 6e |so got their own| 000005f0 20 66 6f 72 6d 61 74 73 2c 20 62 75 74 20 6e 6f | formats, but no| 00000600 20 6f 6e 65 20 75 73 65 73 20 74 68 65 6d 20 28 | one uses them (| 00000610 75 6e 6c 65 73 73 20 6d 61 79 62 65 20 79 6f 75 |unless maybe you| 00000620 27 76 65 20 67 6f 74 20 61 20 43 6f 6c 6f 75 72 |'ve got a Colour| 00000630 43 61 72 64 29 2e 0a 0a 54 68 65 6e 2c 20 74 68 |Card)...Then, th| 00000640 65 72 65 20 61 72 65 20 43 6c 65 61 72 20 66 69 |ere are Clear fi| 00000650 6c 65 73 2e 20 54 68 65 73 65 20 61 72 65 20 65 |les. These are e| 00000660 61 73 79 20 74 6f 20 75 73 65 20 66 72 6f 6d 20 |asy to use from | 00000670 61 20 70 72 6f 67 72 61 6d 6d 65 72 27 73 20 70 |a programmer's p| 00000680 65 72 73 70 65 63 74 69 76 65 2c 20 61 6e 64 20 |erspective, and | 00000690 74 68 65 72 65 20 69 73 20 6f 6e 6c 79 20 6f 6e |there is only on| 000006a0 65 20 43 6c 65 61 72 20 73 74 61 6e 64 61 72 64 |e Clear standard| 000006b0 2c 20 73 6f 20 74 68 65 79 20 72 65 61 6c 6c 79 |, so they really| 000006c0 20 61 72 65 20 70 72 65 74 74 79 20 73 74 61 6e | are pretty stan| 000006d0 64 61 72 64 2e 20 55 73 65 66 75 6c 20 66 6f 72 |dard. Useful for| 000006e0 20 75 73 69 6e 67 20 66 75 6c 6c 20 63 6f 6c 6f | using full colo| 000006f0 75 72 20 69 6d 61 67 65 73 20 6f 6e 20 6f 6c 64 |ur images on old| 00000700 20 6d 61 63 68 69 6e 65 73 2e 20 54 68 65 79 27 | machines. They'| 00000710 72 65 20 61 6c 6d 6f 73 74 20 69 64 65 6e 74 69 |re almost identi| 00000720 63 61 6c 20 74 6f 20 61 20 73 69 6d 69 6c 61 72 |cal to a similar| 00000730 20 66 6f 72 6d 61 74 20 6f 6e 20 6f 74 68 65 72 | format on other| 00000740 20 70 6c 61 74 66 6f 72 6d 73 2c 20 50 6f 72 74 | platforms, Port| 00000750 61 62 6c 65 20 42 69 74 4d 61 70 73 2c 20 6f 72 |able BitMaps, or| 00000760 20 50 42 4d 73 2e 0a 0a 4a 70 65 67 20 66 69 6c | PBMs...Jpeg fil| 00000770 65 73 3a 20 74 68 65 73 65 20 63 6f 6e 74 61 69 |es: these contai| 00000780 6e 2c 20 61 6c 6d 6f 73 74 20 61 6c 77 61 79 73 |n, almost always| 00000790 2c 20 72 65 61 6c 2d 77 6f 72 6c 64 20 69 6d 61 |, real-world ima| 000007a0 67 65 73 20 28 69 65 2e 20 73 63 61 6e 6e 65 64 |ges (ie. scanned| 000007b0 2c 20 64 69 67 69 74 69 73 65 64 2c 20 77 68 61 |, digitised, wha| 000007c0 74 65 76 65 72 29 2c 20 69 6e 20 66 75 6c 6c 20 |tever), in full | 000007d0 28 32 34 2d 62 69 74 29 20 63 6f 6c 6f 75 72 2e |(24-bit) colour.| 000007e0 20 54 68 69 73 20 6e 6f 72 6d 61 6c 6c 79 20 74 | This normally t| 000007f0 61 6b 65 73 20 75 70 20 61 20 6c 6f 74 20 6f 66 |akes up a lot of| 00000800 20 64 69 73 63 20 73 70 61 63 65 20 28 61 20 37 | disc space (a 7| 00000810 36 38 20 78 20 35 31 32 2c 20 66 75 6c 6c 20 63 |68 x 512, full c| 00000820 6f 6c 6f 75 72 20 43 6c 65 61 72 20 66 69 6c 65 |olour Clear file| 00000830 20 63 6f 75 6c 64 20 65 61 73 69 6c 79 20 74 61 | could easily ta| 00000840 6b 65 20 75 70 20 6f 76 65 72 20 31 2e 35 20 4d |ke up over 1.5 M| 00000850 62 2e 20 48 6f 77 65 76 65 72 2c 20 74 68 65 20 |b. However, the | 00000860 69 64 65 6e 74 69 63 61 6c 20 4a 70 65 67 20 66 |identical Jpeg f| 00000870 69 6c 65 20 69 73 20 63 75 6e 6e 69 6e 67 6c 79 |ile is cunningly| 00000880 20 63 6f 6d 70 72 65 73 73 65 64 3a 20 66 69 72 | compressed: fir| 00000890 73 74 2c 20 69 6e 66 6f 72 6d 61 74 69 6f 6e 20 |st, information | 000008a0 74 68 61 74 20 69 73 20 73 6f 20 73 75 62 74 6c |that is so subtl| 000008b0 65 20 69 74 27 73 20 69 6e 76 69 73 62 6c 65 20 |e it's invisble | 000008c0 74 6f 20 74 68 65 20 68 75 6d 61 6e 20 65 79 65 |to the human eye| 000008d0 20 69 73 20 72 65 6d 6f 76 65 64 2e 20 54 68 65 | is removed. The| 000008e0 6e 2c 20 69 74 27 73 20 63 6f 6d 70 72 65 73 73 |n, it's compress| 000008f0 65 64 2c 20 77 68 69 63 68 20 6d 65 61 6e 73 20 |ed, which means | 00000900 69 74 20 74 61 6b 65 73 20 61 73 20 6c 69 74 74 |it takes as litt| 00000910 6c 65 20 61 73 20 32 35 2d 31 30 30 6b 20 6f 72 |le as 25-100k or| 00000920 20 73 6f 20 2d 20 74 68 61 74 27 73 20 61 20 72 | so - that's a r| 00000930 65 64 75 63 74 69 6f 6e 20 74 6f 20 61 62 6f 75 |eduction to abou| 00000940 74 20 32 25 20 6f 66 20 69 74 73 20 6f 72 69 67 |t 2% of its orig| 00000950 69 6e 61 6c 20 73 69 7a 65 2e 20 42 65 63 61 75 |inal size. Becau| 00000960 73 65 20 4a 70 65 67 20 61 6c 6c 6f 77 73 20 79 |se Jpeg allows y| 00000970 6f 75 20 74 6f 20 63 68 6f 6f 73 65 20 74 68 65 |ou to choose the| 00000980 20 71 75 61 6c 69 74 79 20 6f 66 20 74 68 65 20 | quality of the | 00000990 66 69 6e 61 6c 20 69 6d 61 67 65 2c 20 62 61 6c |final image, bal| 000009a0 61 6e 63 69 6e 67 20 69 74 20 61 67 61 69 6e 73 |ancing it agains| 000009b0 74 20 66 69 6c 65 20 73 69 7a 65 2c 20 74 68 69 |t file size, thi| 000009c0 73 20 6d 65 61 6e 73 20 69 74 27 73 20 77 65 6c |s means it's wel| 000009d0 6c 20 67 6f 6f 64 2e 0a 0a 47 49 46 73 20 61 72 |l good...GIFs ar| 000009e0 65 20 32 35 36 20 63 6f 6c 6f 75 72 2c 20 6e 6f |e 256 colour, no| 000009f0 6e 2d 6c 6f 73 73 79 20 63 6f 6d 70 72 65 73 73 |n-lossy compress| 00000a00 65 64 20 69 6d 61 67 65 73 20 66 72 6f 6d 20 74 |ed images from t| 00000a10 68 65 20 50 43 20 77 6f 72 6c 64 2e 20 54 68 65 |he PC world. The| 00000a20 20 63 6f 6d 70 72 65 73 73 69 6f 6e 20 69 73 20 | compression is | 00000a30 6f 6e 6c 79 20 61 72 6f 75 6e 64 20 35 30 25 20 |only around 50% | 00000a40 6f 72 20 73 6f 2c 20 61 6e 64 20 74 68 65 79 27 |or so, and they'| 00000a50 72 65 20 6e 6f 74 20 76 65 72 79 20 67 6f 6f 64 |re not very good| 00000a60 20 66 6f 72 20 71 75 61 6c 69 74 79 20 77 6f 72 | for quality wor| 00000a70 6b 2e 0a 0a 54 61 72 67 61 73 2c 20 77 65 6c 6c |k...Targas, well| 00000a80 20 49 20 68 61 76 65 20 6e 6f 20 69 64 65 61 20 | I have no idea | 00000a90 6f 66 20 61 6e 79 6f 6e 65 20 77 68 6f 20 75 73 |of anyone who us| 00000aa0 65 73 20 74 68 65 73 65 2e 20 54 68 65 79 20 61 |es these. They a| 00000ab0 72 65 20 63 75 72 72 65 6e 74 6c 79 20 75 6e 73 |re currently uns| 00000ac0 75 70 70 6f 72 74 65 64 2c 20 62 75 74 20 74 68 |upported, but th| 00000ad0 65 79 20 6d 69 67 68 74 20 62 65 20 73 6f 6f 6e |ey might be soon| 00000ae0 20 28 77 68 69 63 68 20 69 73 20 77 68 79 20 74 | (which is why t| 00000af0 68 65 20 6f 70 74 69 6f 6e 20 69 73 20 74 68 65 |he option is the| 00000b00 72 65 2e 20 59 6f 75 20 63 61 6e 20 63 6f 6d 70 |re. You can comp| 00000b10 72 65 73 73 20 74 68 65 6d 20 69 6e 74 6f 20 4a |ress them into J| 00000b20 70 65 67 73 2c 20 74 68 6f 75 67 68 20 28 79 6f |pegs, though (yo| 00000b30 75 20 6a 75 73 74 20 63 61 6e 27 74 20 64 65 63 |u just can't dec| 00000b40 6f 6d 70 72 65 73 73 20 69 6e 74 6f 20 74 68 65 |ompress into the| 00000b50 6d 29 2e 0a 0a 52 69 67 68 74 2c 20 74 68 65 20 |m)...Right, the | 00000b60 6f 70 74 69 6f 6e 73 3a 20 74 68 65 79 20 64 69 |options: they di| 00000b70 76 69 64 65 20 69 6e 74 6f 20 74 68 65 20 63 6f |vide into the co| 00000b80 6d 70 72 65 73 73 69 6f 6e 20 6f 70 74 69 6f 6e |mpression option| 00000b90 73 2c 20 66 6f 72 20 63 6f 6d 70 72 65 73 73 69 |s, for compressi| 00000ba0 6e 67 20 61 6e 20 69 6d 61 67 65 20 69 6e 74 6f |ng an image into| 00000bb0 20 61 20 4a 70 65 67 2c 20 61 6e 64 20 74 68 65 | a Jpeg, and the| 00000bc0 20 64 65 63 6f 6d 70 72 65 73 73 69 6f 6e 20 6f | decompression o| 00000bd0 70 74 69 6f 6e 73 20 28 69 66 20 79 6f 75 20 63 |ptions (if you c| 00000be0 61 6e 27 74 20 77 6f 72 6b 20 6f 75 74 20 77 68 |an't work out wh| 00000bf0 61 74 20 74 68 61 74 20 69 73 2c 20 74 68 65 6e |at that is, then| 00000c00 20 49 27 6d 20 6e 6f 74 20 67 6f 69 6e 67 20 74 | I'm not going t| 00000c10 6f 20 74 65 6c 6c 20 79 6f 75 29 2e 20 46 72 6f |o tell you). Fro| 00000c20 6d 20 74 6f 70 20 74 6f 20 62 6f 74 74 6f 6d 3a |m top to bottom:| 00000c30 0a 51 75 61 6c 69 74 79 3a 20 46 72 6f 6d 20 30 |.Quality: From 0| 00000c40 20 28 75 6c 74 72 61 20 6c 6f 77 20 71 75 61 6c | (ultra low qual| 00000c50 69 74 79 20 2f 20 74 69 6e 79 20 66 69 6c 65 73 |ity / tiny files| 00000c60 29 20 74 6f 20 31 30 30 20 28 6e 6f 20 70 69 63 |) to 100 (no pic| 00000c70 74 75 72 65 20 6c 6f 73 73 2c 20 61 6e 74 69 2d |ture loss, anti-| 00000c80 63 6f 6d 70 72 65 73 73 69 6f 6e 29 2e 20 41 62 |compression). Ab| 00000c90 6f 75 74 20 37 35 20 69 73 20 72 65 63 6f 6d 6d |out 75 is recomm| 00000ca0 65 6e 64 65 64 2c 20 62 75 74 20 69 66 20 79 6f |ended, but if yo| 00000cb0 75 20 6a 75 73 74 20 77 61 6e 74 20 61 20 6c 6f |u just want a lo| 00000cc0 77 20 71 75 61 6c 69 74 79 20 74 68 75 6d 62 6e |w quality thumbn| 00000cd0 61 69 6c 2c 20 79 6f 75 20 63 61 6e 20 65 61 73 |ail, you can eas| 00000ce0 69 6c 79 20 67 6f 20 61 73 20 6c 6f 77 20 61 73 |ily go as low as| 00000cf0 20 34 30 2e 20 41 20 71 75 69 74 65 20 69 6e 74 | 40. A quite int| 00000d00 65 72 65 73 74 69 6e 67 20 74 68 69 6e 67 20 74 |eresting thing t| 00000d10 6f 20 64 6f 20 69 73 20 72 65 64 75 63 65 20 69 |o do is reduce i| 00000d20 74 20 74 6f 20 61 62 6f 75 74 20 33 2c 20 77 68 |t to about 3, wh| 00000d30 69 63 68 20 77 69 6c 6c 20 67 69 76 65 20 61 20 |ich will give a | 00000d40 76 65 72 79 20 6f 64 64 20 69 6d 61 67 65 2c 20 |very odd image, | 00000d50 77 68 69 63 68 20 63 61 6e 27 74 20 62 65 20 72 |which can't be r| 00000d60 65 63 6f 67 6e 69 73 65 64 20 6e 6f 72 6d 61 6c |ecognised normal| 00000d70 6c 79 2c 20 74 68 65 6e 20 73 71 75 69 6e 74 20 |ly, then squint | 00000d80 61 74 20 69 74 2c 20 61 6e 64 20 69 74 27 73 20 |at it, and it's | 00000d90 71 75 69 74 65 20 69 6e 63 72 65 64 69 62 6c 65 |quite incredible| 00000da0 20 74 68 65 20 61 6d 6f 75 6e 74 20 6f 66 20 64 | the amount of d| 00000db0 65 74 61 69 6c 20 79 6f 75 72 20 62 72 61 69 6e |etail your brain| 00000dc0 20 63 61 6e 20 66 69 6c 6c 20 69 6e 2e 20 57 69 | can fill in. 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I'd leave| 00000f40 20 69 74 20 61 6c 6f 6e 65 2c 20 63 61 75 73 65 | it alone, cause| 00000f50 20 69 74 20 64 6f 6e 27 74 20 64 6f 20 6e 6f 74 | it don't do not| 00000f60 68 69 6e 67 20 6d 75 63 68 20 79 65 74 2e 0a 4e |hing much yet..N| 00000f70 6f 6e 2d 69 6e 74 65 72 6c 65 61 76 65 64 3a 20 |on-interleaved: | 00000f80 6e 6f 74 20 69 6d 70 6c 65 6d 65 6e 74 65 64 20 |not implemented | 00000f90 69 6e 20 74 68 65 20 63 6f 6d 70 72 65 73 73 6f |in the compresso| 00000fa0 72 20 79 65 74 2e 0a 41 72 69 74 68 6d 65 74 69 |r yet..Arithmeti| 00000fb0 63 20 63 6f 64 69 6e 67 3a 20 6e 6f 74 20 69 6d |c coding: not im| 00000fc0 70 6c 65 6d 65 6e 74 65 64 2c 20 61 6e 64 20 6e |plemented, and n| 00000fd0 6f 74 20 6c 69 6b 65 6c 79 20 2d 20 69 74 20 72 |ot likely - it r| 00000fe0 65 71 75 69 72 65 73 20 61 20 77 68 61 63 6b 69 |equires a whacki| 00000ff0 6e 67 20 67 72 65 61 74 20 6c 69 63 65 6e 73 65 |ng great license| 00001000 20 66 65 65 0a 0a 41 6e 64 20 74 68 65 20 64 65 | fee..And the de| 00001010 63 6f 6d 70 72 65 73 73 69 6f 6e 20 6f 70 74 69 |compression opti| 00001020 6f 6e 73 3a 0a 51 75 61 6e 74 69 7a 65 3a 20 72 |ons:.Quantize: r| 00001030 65 64 75 63 65 20 74 68 65 20 6e 75 6d 62 65 72 |educe the number| 00001040 20 6f 66 20 63 6f 6c 6f 75 72 73 20 64 6f 77 6e | of colours down| 00001050 20 74 6f 20 61 6d 6f 75 6e 74 20 73 70 65 63 69 | to amount speci| 00001060 66 69 65 64 20 62 79 20 79 6f 75 2e 20 4d 79 20 |fied by you. 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Y| 00001380 6f 75 20 63 61 6e 20 73 65 6c 65 63 74 20 74 68 |ou can select th| 00001390 65 20 66 69 6c 65 2d 74 79 70 65 20 74 6f 20 73 |e file-type to s| 000013a0 61 76 65 20 69 66 20 79 6f 75 20 64 72 61 67 67 |ave if you dragg| 000013b0 65 64 20 69 6e 20 61 20 4a 70 65 67 3b 20 69 66 |ed in a Jpeg; if| 000013c0 20 6e 6f 74 2c 20 79 6f 75 20 63 61 6e 20 6f 6e | not, you can on| 000013d0 6c 79 20 6f 75 70 75 74 20 4a 70 65 67 73 2e 20 |ly ouput Jpegs. | 000013e0 54 68 65 20 63 68 6f 69 63 65 73 20 61 72 65 3a |The choices are:| 000013f0 20 4a 70 65 67 2c 20 43 6c 65 61 72 2c 20 53 70 | Jpeg, Clear, Sp| 00001400 72 69 74 65 2c 20 32 34 2d 62 69 74 20 73 70 72 |rite, 24-bit spr| 00001410 69 74 65 2c 20 47 49 46 20 61 6e 64 20 54 61 72 |ite, GIF and Tar| 00001420 67 61 2e 20 53 61 76 65 20 69 74 20 69 6e 20 74 |ga. 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Thanks als| 000015e0 6f 20 74 6f 3a 20 44 6f 67 67 79 73 6f 66 74 20 |o to: Doggysoft | 000015f0 28 66 6f 72 20 74 68 65 20 57 69 6d 70 45 78 74 |(for the WimpExt| 00001600 65 6e 73 69 6f 6e 20 6d 6f 64 75 6c 65 29 2c 20 |ension module), | 00001610 6d 65 2c 20 44 61 76 65 20 4d 63 43 61 72 74 6e |me, Dave McCartn| 00001620 65 79 20 6f 66 20 74 68 65 20 44 61 74 61 66 69 |ey of the Datafi| 00001630 6c 65 2e 20 54 68 69 73 20 73 6f 66 74 77 61 72 |le. This softwar| 00001640 65 20 69 73 20 62 61 73 65 64 20 69 6e 20 70 61 |e is based in pa| 00001650 72 74 20 6f 6e 20 74 68 65 20 77 6f 72 6b 20 6f |rt on the work o| 00001660 66 20 74 68 65 20 49 6e 64 65 70 65 6e 64 65 6e |f the Independen| 00001670 74 20 4a 50 45 47 20 47 72 6f 75 70 2e 20 42 75 |t JPEG Group. 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And neither | 000016e0 61 6d 20 49 2c 20 66 6f 72 20 74 68 61 74 20 6d |am I, for that m| 000016f0 61 74 74 65 72 2e 0a 49 20 70 72 6f 62 61 62 6c |atter..I probabl| 00001700 79 20 6f 75 67 68 74 20 74 6f 20 73 61 79 3a 20 |y ought to say: | 00001710 22 54 68 65 20 47 72 61 70 68 69 63 73 20 49 6e |"The Graphics In| 00001720 74 65 72 63 68 61 6e 67 65 20 46 6f 72 6d 61 74 |terchange Format| 00001730 28 63 29 20 69 73 20 74 68 65 20 43 6f 70 79 72 |(c) is the Copyr| 00001740 69 67 68 74 20 70 72 6f 70 65 72 74 79 20 6f 66 |ight property of| 00001750 20 43 6f 6d 70 75 53 65 72 76 65 20 49 6e 63 6f | CompuServe Inco| 00001760 72 70 6f 72 61 74 65 64 2e 20 20 47 49 46 28 73 |rporated. GIF(s| 00001770 6d 29 20 69 73 20 61 20 53 65 72 76 69 63 65 20 |m) is a Service | 00001780 4d 61 72 6b 20 70 72 6f 70 65 72 74 79 20 6f 66 |Mark property of| 00001790 20 43 6f 6d 70 75 53 65 72 76 65 20 49 6e 63 6f | CompuServe Inco| 000017a0 72 70 6f 72 61 74 65 64 2e 22 20 61 73 20 77 65 |rporated." as we| 000017b0 6c 6c 20 68 65 72 65 2c 20 62 75 74 20 49 20 64 |ll here, but I d| 000017c0 6f 6e 27 74 20 66 65 65 6c 20 6c 69 6b 65 20 69 |on't feel like i| 000017d0 74 2c 20 73 6f 20 49 20 77 6f 6e 27 74 2e |t, so I won't.| 000017de
.