Home » Archimedes archive » Acorn User » AU 1996-05.adf » Optical » !Manual/Data/Chapter5
!Manual/Data/Chapter5
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.
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File contents
Chapter 5 Preferences This chapter describes the various options available to adapt Optical to the user's own particular use, by using the Preferences window. To view this, select Preferences... from the Icon bar menu. 5.1 Processing options 5.1.1 Auto scan With Auto scan selected, the direct scan window pops up for the scanning of a new page each time Optical is loaded and when it finishes OCRing a page. More can be found about scanning an image in Chapter 4.3 - Direct scanning . 5.1.2 Auto find columns If this is selected then Optical will attempt to locate columns of text on a page automatically. Clicking on the button to the right of this option opens another window. The Horizontal gaps value determines the minimum gap size that Optical looks for to separate the top of one column from the bottom of one above. If this is too small then individual lines of text may be found as columns. If too large, then columns may get joined together. The Vertical gaps value has the same function as the above, except that it works with adjacent columns. 5.1.3 Preview / process With this option selected, the image scanned or loaded into Optical is displayed before it is read. It is then also possible to process the image. More can be found about this feature in Chapter 6 - Processing an image . 5.1.4 Format text Details about the Text formatter can be found in Chapter 8.3 - Formatting the OCRed text . 5.1.5 Read out after This feature is not functional with the demonstration version... With this option selected, text is read out loud after it has been OCRed, providing a compatible speech synthesizer is installed. The speech synthesizer is selected by clicking on the button to the right of this option, and selecting one of the available options. Currently, the following are supported: ARCticulate from The Fourth Dimension Speech! from Superior Software SpeechSystem from PEP Associates Note It is not possible to select a different speech synthesizer while talking is in progress. More details about this can be found in Chapter 7.1.11 - Read out... . 5.2 General preferences 5.2.1 Auto-load lexicon With this option selected, the selected lexicon is automatically loaded when Optical is loaded. For more details on spelling checking, see Chapter 8.1 - The Spelling Checker . 5.2.2 Keep previous frames With this selected, previously marked text columns are not cleared when new images are scanned into Optical. For more details on marking columns see Chapter 6.4.1 - Marking a column of text . 5.2.3 Multi-task If this is selected, it is possible to perform other operations on the computer while Optical is reading or spelling checking. 5.2.4 Read ahead in TT If selected then when Optical is in type teaching mode (see Chapter 9.2.2 - Type teaching ) the entire scanned text is continually re-ocred as the user types in corrections. 5.2.5 Use TWAIN If selected, then direct scanning is performed using one of David Pilling 's TWAIN drivers. (see Chapter 4.3.1 - TWAIN for more details.) 5.3 Other reading options 5.3.1 Character size The minimum (min ) and the maximum (max ) character sizes mark the limits on the size of a marking which Optical will detect on a page. As Optical will not detect anything below the minimum character size (specified in pixels - the small dots which make up an image), it is useful for filtering out background noise - small spurious black dots from dust on the paper, or the scanner window etc. By altering the maximum character size, it is possible to filter out large objects on a page which are not text (such as some graphics, and vertical or horizontal lines.) Note that large characters (from headings etc.) may also be ignored. 5.3.2 Accuracy / speed The slider bar in this area can be adjusted to control the speed at which Optical reads, against the accuracy. The more green (Speed ) in the slider, the faster the read. The more red (Accuracy ), the slower the read, but the more accurate. A reference number from one to four is also displayed to the left of this. If the Check spelling option is selected then OCRed text is automatically checked for spelling mistakes after it has been read. If correct is also selected then Optical intelligently guesses what a mistake should be, and replaces it. This increases the accuracy of the output, but slows things down. If correct is not selected then words which are not recognised are highlighted in orange. More details about the Spelling checker can be found in Chapter 8.1 - The Spelling Checker . Next to Cope with are two options: If lines is selected, then Optical will search through lines such as those in tables, and detect the text inside. Otherwise the text is ignored. If 'scripts is selected then Optical will attempt to pick up superscript and subscript changes, which can be saved in RTF and DDF files. Narrow columns (tables etc.) should be selected if narrow columns of text (one or two characters across) are not detected properly. This will not work with normal lines of text. 5.4 Other buttons Pressing MLE... allows you to alter which applications use Menu Linked Embedding . For more details see Chapter 4.4 - Menu Linked Embedding (MLE) . Save saves all settings to disc, so that they do not have to be re-selected each time Optical is loaded. As well as the ones from the Preferences window, it also saves options such as how text is displayed in the OCRed text window, and whether new text should be appended. Cancel puts any changed options back to what they were originally when the Preferences window was opened. OK accepts any changes and closes the window.
00000000 01 43 68 61 70 74 65 72 20 35 0a 0a 50 72 65 66 |.Chapter 5..Pref| 00000010 65 72 65 6e 63 65 73 0a 00 0a 0a 54 68 69 73 20 |erences....This | 00000020 63 68 61 70 74 65 72 20 64 65 73 63 72 69 62 65 |chapter describe| 00000030 73 20 74 68 65 20 76 61 72 69 6f 75 73 20 6f 70 |s the various op| 00000040 74 69 6f 6e 73 20 61 76 61 69 6c 61 62 6c 65 20 |tions available | 00000050 74 6f 20 61 64 61 70 74 20 4f 70 74 69 63 61 6c |to adapt Optical| 00000060 20 74 6f 20 74 68 65 20 75 73 65 72 27 73 20 6f | to the user's o| 00000070 77 6e 20 70 61 72 74 69 63 75 6c 61 72 20 75 73 |wn particular us| 00000080 65 2c 20 62 79 20 75 73 69 6e 67 20 74 68 65 20 |e, by using the | 00000090 04 05 50 72 65 66 65 72 65 6e 63 65 73 20 00 77 |..Preferences .w| 000000a0 69 6e 64 6f 77 2e 20 54 6f 20 76 69 65 77 20 74 |indow. To view t| 000000b0 68 69 73 2c 20 73 65 6c 65 63 74 20 04 05 50 72 |his, select ..Pr| 000000c0 65 66 65 72 65 6e 63 65 73 2e 2e 2e 00 20 66 72 |eferences.... fr| 000000d0 6f 6d 20 74 68 65 20 04 05 49 63 6f 6e 20 62 61 |om the ..Icon ba| 000000e0 72 00 20 6d 65 6e 75 2e 0a 0a 0a 02 35 2e 31 20 |r. menu.....5.1 | 000000f0 50 72 6f 63 65 73 73 69 6e 67 20 6f 70 74 69 6f |Processing optio| 00000100 6e 73 0a 0a 00 03 35 2e 31 2e 31 20 41 75 74 6f |ns....5.1.1 Auto| 00000110 20 73 63 61 6e 0a 0a 00 57 69 74 68 20 05 04 41 | scan...With ..A| 00000120 75 74 6f 20 73 63 61 6e 00 20 73 65 6c 65 63 74 |uto scan. select| 00000130 65 64 2c 20 74 68 65 20 64 69 72 65 63 74 20 73 |ed, the direct s| 00000140 63 61 6e 20 77 69 6e 64 6f 77 20 70 6f 70 73 20 |can window pops | 00000150 75 70 20 66 6f 72 20 74 68 65 20 73 63 61 6e 6e |up for the scann| 00000160 69 6e 67 20 6f 66 20 61 20 6e 65 77 20 70 61 67 |ing of a new pag| 00000170 65 20 65 61 63 68 20 74 69 6d 65 20 4f 70 74 69 |e each time Opti| 00000180 63 61 6c 04 20 00 69 73 20 6c 6f 61 64 65 64 20 |cal. .is loaded | 00000190 61 6e 64 20 77 68 65 6e 20 69 74 20 66 69 6e 69 |and when it fini| 000001a0 73 68 65 73 20 4f 43 52 69 6e 67 20 61 20 70 61 |shes OCRing a pa| 000001b0 67 65 2e 0a 0a 4d 6f 72 65 20 63 61 6e 20 62 65 |ge...More can be| 000001c0 20 66 6f 75 6e 64 20 61 62 6f 75 74 20 73 63 61 | found about sca| 000001d0 6e 6e 69 6e 67 20 61 6e 20 69 6d 61 67 65 20 69 |nning an image i| 000001e0 6e 20 07 43 68 61 70 74 65 72 20 34 2e 33 20 2d |n .Chapter 4.3 -| 000001f0 20 44 69 72 65 63 74 20 73 63 61 6e 6e 69 6e 67 | Direct scanning| 00000200 00 2e 0a 0a 03 35 2e 31 2e 32 20 41 75 74 6f 20 |.....5.1.2 Auto | 00000210 66 69 6e 64 20 63 6f 6c 75 6d 6e 73 0a 0a 00 49 |find columns...I| 00000220 66 20 74 68 69 73 20 69 73 20 73 65 6c 65 63 74 |f this is select| 00000230 65 64 20 74 68 65 6e 20 4f 70 74 69 63 61 6c 20 |ed then Optical | 00000240 77 69 6c 6c 20 61 74 74 65 6d 70 74 20 74 6f 20 |will attempt to | 00000250 6c 6f 63 61 74 65 20 63 6f 6c 75 6d 6e 73 20 6f |locate columns o| 00000260 66 20 74 65 78 74 20 6f 6e 20 61 20 70 61 67 65 |f text on a page| 00000270 20 61 75 74 6f 6d 61 74 69 63 61 6c 6c 79 2e 0a | automatically..| 00000280 0a 43 6c 69 63 6b 69 6e 67 20 6f 6e 20 74 68 65 |.Clicking on the| 00000290 20 62 75 74 74 6f 6e 20 74 6f 20 74 68 65 20 72 | button to the r| 000002a0 69 67 68 74 20 6f 66 20 74 68 69 73 20 6f 70 74 |ight of this opt| 000002b0 69 6f 6e 20 6f 70 65 6e 73 20 61 6e 6f 74 68 65 |ion opens anothe| 000002c0 72 20 77 69 6e 64 6f 77 2e 0a 0a 54 68 65 20 04 |r window...The .| 000002d0 05 48 6f 72 69 7a 6f 6e 74 61 6c 20 67 61 70 73 |.Horizontal gaps| 000002e0 00 20 76 61 6c 75 65 20 64 65 74 65 72 6d 69 6e |. value determin| 000002f0 65 73 20 74 68 65 20 6d 69 6e 69 6d 75 6d 20 67 |es the minimum g| 00000300 61 70 20 73 69 7a 65 20 74 68 61 74 20 4f 70 74 |ap size that Opt| 00000310 69 63 61 6c 20 6c 6f 6f 6b 73 20 66 6f 72 20 74 |ical looks for t| 00000320 6f 20 73 65 70 61 72 61 74 65 20 74 68 65 20 74 |o separate the t| 00000330 6f 70 20 6f 66 20 6f 6e 65 20 63 6f 6c 75 6d 6e |op of one column| 00000340 20 66 72 6f 6d 20 74 68 65 20 62 6f 74 74 6f 6d | from the bottom| 00000350 20 6f 66 20 6f 6e 65 20 61 62 6f 76 65 2e 20 49 | of one above. I| 00000360 66 20 74 68 69 73 20 69 73 20 74 6f 6f 20 73 6d |f this is too sm| 00000370 61 6c 6c 20 74 68 65 6e 20 69 6e 64 69 76 69 64 |all then individ| 00000380 75 61 6c 20 6c 69 6e 65 73 20 6f 66 20 74 65 78 |ual lines of tex| 00000390 74 20 6d 61 79 20 62 65 20 66 6f 75 6e 64 20 61 |t may be found a| 000003a0 73 20 63 6f 6c 75 6d 6e 73 2e 20 49 66 20 74 6f |s columns. If to| 000003b0 6f 20 6c 61 72 67 65 2c 20 74 68 65 6e 20 63 6f |o large, then co| 000003c0 6c 75 6d 6e 73 20 6d 61 79 20 67 65 74 20 6a 6f |lumns may get jo| 000003d0 69 6e 65 64 20 74 6f 67 65 74 68 65 72 2e 0a 0a |ined together...| 000003e0 54 68 65 20 04 05 56 65 72 74 69 63 61 6c 20 67 |The ..Vertical g| 000003f0 61 70 73 00 20 76 61 6c 75 65 20 68 61 73 20 74 |aps. value has t| 00000400 68 65 20 73 61 6d 65 20 66 75 6e 63 74 69 6f 6e |he same function| 00000410 20 61 73 20 74 68 65 20 61 62 6f 76 65 2c 20 65 | as the above, e| 00000420 78 63 65 70 74 20 74 68 61 74 20 69 74 20 77 6f |xcept that it wo| 00000430 72 6b 73 20 77 69 74 68 20 61 64 6a 61 63 65 6e |rks with adjacen| 00000440 74 20 63 6f 6c 75 6d 6e 73 2e 0a 0a 03 35 2e 31 |t columns....5.1| 00000450 2e 33 20 50 72 65 76 69 65 77 20 2f 20 70 72 6f |.3 Preview / pro| 00000460 63 65 73 73 0a 0a 00 57 69 74 68 20 74 68 69 73 |cess...With this| 00000470 20 6f 70 74 69 6f 6e 20 73 65 6c 65 63 74 65 64 | option selected| 00000480 2c 20 74 68 65 20 69 6d 61 67 65 20 73 63 61 6e |, the image scan| 00000490 6e 65 64 20 6f 72 20 6c 6f 61 64 65 64 20 69 6e |ned or loaded in| 000004a0 74 6f 20 4f 70 74 69 63 61 6c 20 69 73 20 64 69 |to Optical is di| 000004b0 73 70 6c 61 79 65 64 20 62 65 66 6f 72 65 20 69 |splayed before i| 000004c0 74 20 69 73 20 72 65 61 64 2e 20 49 74 20 69 73 |t is read. It is| 000004d0 20 74 68 65 6e 20 61 6c 73 6f 20 70 6f 73 73 69 | then also possi| 000004e0 62 6c 65 20 74 6f 20 70 72 6f 63 65 73 73 20 74 |ble to process t| 000004f0 68 65 20 69 6d 61 67 65 2e 0a 0a 4d 6f 72 65 20 |he image...More | 00000500 63 61 6e 20 62 65 20 66 6f 75 6e 64 20 61 62 6f |can be found abo| 00000510 75 74 20 74 68 69 73 20 66 65 61 74 75 72 65 20 |ut this feature | 00000520 69 6e 20 07 43 68 61 70 74 65 72 20 36 20 2d 20 |in .Chapter 6 - | 00000530 50 72 6f 63 65 73 73 69 6e 67 20 61 6e 20 69 6d |Processing an im| 00000540 61 67 65 00 2e 0a 0a 03 35 2e 31 2e 34 20 46 6f |age.....5.1.4 Fo| 00000550 72 6d 61 74 20 74 65 78 74 0a 0a 00 44 65 74 61 |rmat text...Deta| 00000560 69 6c 73 20 61 62 6f 75 74 20 74 68 65 20 04 05 |ils about the ..| 00000570 54 65 78 74 20 66 6f 72 6d 61 74 74 65 72 00 20 |Text formatter. | 00000580 63 61 6e 20 62 65 20 66 6f 75 6e 64 20 69 6e 20 |can be found in | 00000590 07 43 68 61 70 74 65 72 20 38 2e 33 20 2d 20 46 |.Chapter 8.3 - F| 000005a0 6f 72 6d 61 74 74 69 6e 67 20 74 68 65 20 4f 43 |ormatting the OC| 000005b0 52 65 64 20 74 65 78 74 00 2e 0a 0a 03 35 2e 31 |Red text.....5.1| 000005c0 2e 35 20 52 65 61 64 20 6f 75 74 20 61 66 74 65 |.5 Read out afte| 000005d0 72 0a 0a 00 05 54 68 69 73 20 66 65 61 74 75 72 |r....This featur| 000005e0 65 20 69 73 20 6e 6f 74 20 66 75 6e 63 74 69 6f |e is not functio| 000005f0 6e 61 6c 20 77 69 74 68 20 74 68 65 20 64 65 6d |nal with the dem| 00000600 6f 6e 73 74 72 61 74 69 6f 6e 20 76 65 72 73 69 |onstration versi| 00000610 6f 6e 2e 2e 2e 0a 00 0a 57 69 74 68 20 74 68 69 |on......With thi| 00000620 73 20 6f 70 74 69 6f 6e 20 73 65 6c 65 63 74 65 |s option selecte| 00000630 64 2c 20 74 65 78 74 20 69 73 20 72 65 61 64 20 |d, text is read | 00000640 6f 75 74 20 6c 6f 75 64 20 61 66 74 65 72 20 69 |out loud after i| 00000650 74 20 68 61 73 20 62 65 65 6e 20 4f 43 52 65 64 |t has been OCRed| 00000660 2c 20 70 72 6f 76 69 64 69 6e 67 20 61 20 63 6f |, providing a co| 00000670 6d 70 61 74 69 62 6c 65 20 73 70 65 65 63 68 20 |mpatible speech | 00000680 73 79 6e 74 68 65 73 69 7a 65 72 20 69 73 20 69 |synthesizer is i| 00000690 6e 73 74 61 6c 6c 65 64 2e 20 54 68 65 20 73 70 |nstalled. The sp| 000006a0 65 65 63 68 20 73 79 6e 74 68 65 73 69 7a 65 72 |eech synthesizer| 000006b0 20 69 73 20 73 65 6c 65 63 74 65 64 20 62 79 20 | is selected by | 000006c0 63 6c 69 63 6b 69 6e 67 20 6f 6e 20 74 68 65 20 |clicking on the | 000006d0 62 75 74 74 6f 6e 20 74 6f 20 74 68 65 20 72 69 |button to the ri| 000006e0 67 68 74 20 6f 66 20 74 68 69 73 20 6f 70 74 69 |ght of this opti| 000006f0 6f 6e 2c 20 61 6e 64 20 73 65 6c 65 63 74 69 6e |on, and selectin| 00000700 67 20 6f 6e 65 20 6f 66 20 74 68 65 20 61 76 61 |g one of the ava| 00000710 69 6c 61 62 6c 65 20 6f 70 74 69 6f 6e 73 2e 0a |ilable options..| 00000720 0a 43 75 72 72 65 6e 74 6c 79 2c 20 74 68 65 20 |.Currently, the | 00000730 66 6f 6c 6c 6f 77 69 6e 67 20 61 72 65 20 73 75 |following are su| 00000740 70 70 6f 72 74 65 64 3a 0a 04 41 52 43 74 69 63 |pported:..ARCtic| 00000750 75 6c 61 74 65 20 00 66 72 6f 6d 20 54 68 65 20 |ulate .from The | 00000760 46 6f 75 72 74 68 20 44 69 6d 65 6e 73 69 6f 6e |Fourth Dimension| 00000770 0a 04 53 70 65 65 63 68 21 00 20 66 72 6f 6d 20 |..Speech!. from | 00000780 53 75 70 65 72 69 6f 72 20 53 6f 66 74 77 61 72 |Superior Softwar| 00000790 65 0a 04 53 70 65 65 63 68 53 79 73 74 65 6d 20 |e..SpeechSystem | 000007a0 00 66 72 6f 6d 20 50 45 50 20 41 73 73 6f 63 69 |.from PEP Associ| 000007b0 61 74 65 73 0a 0a 05 4e 6f 74 65 20 00 49 74 20 |ates...Note .It | 000007c0 69 73 20 6e 6f 74 20 70 6f 73 73 69 62 6c 65 20 |is not possible | 000007d0 74 6f 20 73 65 6c 65 63 74 20 61 20 64 69 66 66 |to select a diff| 000007e0 65 72 65 6e 74 20 73 70 65 65 63 68 20 73 79 6e |erent speech syn| 000007f0 74 68 65 73 69 7a 65 72 20 77 68 69 6c 65 20 74 |thesizer while t| 00000800 61 6c 6b 69 6e 67 20 69 73 20 69 6e 20 70 72 6f |alking is in pro| 00000810 67 72 65 73 73 2e 0a 0a 4d 6f 72 65 20 64 65 74 |gress...More det| 00000820 61 69 6c 73 20 61 62 6f 75 74 20 74 68 69 73 04 |ails about this.| 00000830 05 20 00 63 61 6e 20 62 65 20 66 6f 75 6e 64 20 |. .can be found | 00000840 69 6e 20 07 43 68 61 70 74 65 72 20 37 2e 31 2e |in .Chapter 7.1.| 00000850 31 31 20 2d 20 52 65 61 64 20 6f 75 74 2e 2e 2e |11 - Read out...| 00000860 00 2e 0a 0a 0a 02 35 2e 32 20 47 65 6e 65 72 61 |......5.2 Genera| 00000870 6c 20 70 72 65 66 65 72 65 6e 63 65 73 0a 00 03 |l preferences...| 00000880 0a 35 2e 32 2e 31 20 41 75 74 6f 2d 6c 6f 61 64 |.5.2.1 Auto-load| 00000890 20 6c 65 78 69 63 6f 6e 0a 0a 00 57 69 74 68 20 | lexicon...With | 000008a0 74 68 69 73 20 6f 70 74 69 6f 6e 20 73 65 6c 65 |this option sele| 000008b0 63 74 65 64 2c 20 74 68 65 20 73 65 6c 65 63 74 |cted, the select| 000008c0 65 64 20 6c 65 78 69 63 6f 6e 20 69 73 20 61 75 |ed lexicon is au| 000008d0 74 6f 6d 61 74 69 63 61 6c 6c 79 20 6c 6f 61 64 |tomatically load| 000008e0 65 64 20 77 68 65 6e 20 4f 70 74 69 63 61 6c 20 |ed when Optical | 000008f0 69 73 20 6c 6f 61 64 65 64 2e 20 46 6f 72 20 6d |is loaded. For m| 00000900 6f 72 65 20 64 65 74 61 69 6c 73 20 6f 6e 20 73 |ore details on s| 00000910 70 65 6c 6c 69 6e 67 20 63 68 65 63 6b 69 6e 67 |pelling checking| 00000920 2c 20 73 65 65 20 07 43 68 61 70 74 65 72 20 38 |, see .Chapter 8| 00000930 2e 31 20 2d 20 54 68 65 20 53 70 65 6c 6c 69 6e |.1 - The Spellin| 00000940 67 20 43 68 65 63 6b 65 72 00 2e 0a 0a 03 35 2e |g Checker.....5.| 00000950 32 2e 32 20 4b 65 65 70 20 70 72 65 76 69 6f 75 |2.2 Keep previou| 00000960 73 20 66 72 61 6d 65 73 0a 0a 00 57 69 74 68 20 |s frames...With | 00000970 74 68 69 73 20 73 65 6c 65 63 74 65 64 2c 20 70 |this selected, p| 00000980 72 65 76 69 6f 75 73 6c 79 20 6d 61 72 6b 65 64 |reviously marked| 00000990 20 74 65 78 74 20 63 6f 6c 75 6d 6e 73 20 61 72 | text columns ar| 000009a0 65 20 6e 6f 74 20 63 6c 65 61 72 65 64 20 77 68 |e not cleared wh| 000009b0 65 6e 20 6e 65 77 20 69 6d 61 67 65 73 20 61 72 |en new images ar| 000009c0 65 20 73 63 61 6e 6e 65 64 20 69 6e 74 6f 20 4f |e scanned into O| 000009d0 70 74 69 63 61 6c 2e 20 46 6f 72 20 6d 6f 72 65 |ptical. For more| 000009e0 20 64 65 74 61 69 6c 73 20 6f 6e 20 6d 61 72 6b | details on mark| 000009f0 69 6e 67 20 63 6f 6c 75 6d 6e 73 20 73 65 65 20 |ing columns see | 00000a00 07 43 68 61 70 74 65 72 20 36 2e 34 2e 31 20 2d |.Chapter 6.4.1 -| 00000a10 20 4d 61 72 6b 69 6e 67 20 61 20 63 6f 6c 75 6d | Marking a colum| 00000a20 6e 20 6f 66 20 74 65 78 74 00 2e 0a 0a 03 35 2e |n of text.....5.| 00000a30 32 2e 33 20 4d 75 6c 74 69 2d 74 61 73 6b 0a 0a |2.3 Multi-task..| 00000a40 00 49 66 20 74 68 69 73 20 69 73 20 73 65 6c 65 |.If this is sele| 00000a50 63 74 65 64 2c 20 69 74 20 69 73 20 70 6f 73 73 |cted, it is poss| 00000a60 69 62 6c 65 20 74 6f 20 70 65 72 66 6f 72 6d 20 |ible to perform | 00000a70 6f 74 68 65 72 20 6f 70 65 72 61 74 69 6f 6e 73 |other operations| 00000a80 20 6f 6e 20 74 68 65 20 63 6f 6d 70 75 74 65 72 | on the computer| 00000a90 20 77 68 69 6c 65 20 4f 70 74 69 63 61 6c 20 69 | while Optical i| 00000aa0 73 20 72 65 61 64 69 6e 67 20 6f 72 20 73 70 65 |s reading or spe| 00000ab0 6c 6c 69 6e 67 20 63 68 65 63 6b 69 6e 67 2e 0a |lling checking..| 00000ac0 0a 03 35 2e 32 2e 34 20 52 65 61 64 20 61 68 65 |..5.2.4 Read ahe| 00000ad0 61 64 20 69 6e 20 54 54 0a 0a 00 49 66 20 73 65 |ad in TT...If se| 00000ae0 6c 65 63 74 65 64 20 74 68 65 6e 20 77 68 65 6e |lected then when| 00000af0 20 4f 70 74 69 63 61 6c 20 69 73 20 69 6e 20 74 | Optical is in t| 00000b00 79 70 65 20 74 65 61 63 68 69 6e 67 20 6d 6f 64 |ype teaching mod| 00000b10 65 20 28 73 65 65 20 07 43 68 61 70 74 65 72 20 |e (see .Chapter | 00000b20 39 2e 32 2e 32 20 2d 20 54 79 70 65 20 74 65 61 |9.2.2 - Type tea| 00000b30 63 68 69 6e 67 00 29 20 74 68 65 20 65 6e 74 69 |ching.) the enti| 00000b40 72 65 20 73 63 61 6e 6e 65 64 20 74 65 78 74 20 |re scanned text | 00000b50 69 73 20 63 6f 6e 74 69 6e 75 61 6c 6c 79 20 72 |is continually r| 00000b60 65 2d 6f 63 72 65 64 20 61 73 20 74 68 65 20 75 |e-ocred as the u| 00000b70 73 65 72 20 74 79 70 65 73 20 69 6e 20 63 6f 72 |ser types in cor| 00000b80 72 65 63 74 69 6f 6e 73 2e 0a 0a 03 35 2e 32 2e |rections....5.2.| 00000b90 35 20 55 73 65 20 54 57 41 49 4e 0a 0a 00 49 66 |5 Use TWAIN...If| 00000ba0 20 73 65 6c 65 63 74 65 64 2c 20 74 68 65 6e 20 | selected, then | 00000bb0 64 69 72 65 63 74 20 73 63 61 6e 6e 69 6e 67 20 |direct scanning | 00000bc0 69 73 20 70 65 72 66 6f 72 6d 65 64 20 75 73 69 |is performed usi| 00000bd0 6e 67 20 6f 6e 65 20 6f 66 20 04 44 61 76 69 64 |ng one of .David| 00000be0 20 50 69 6c 6c 69 6e 67 00 27 73 20 04 54 57 41 | Pilling.'s .TWA| 00000bf0 49 4e 20 00 64 72 69 76 65 72 73 2e 20 28 73 65 |IN .drivers. (se| 00000c00 65 20 07 43 68 61 70 74 65 72 20 34 2e 33 2e 31 |e .Chapter 4.3.1| 00000c10 20 2d 20 54 57 41 49 4e 00 20 66 6f 72 20 6d 6f | - TWAIN. for mo| 00000c20 72 65 20 64 65 74 61 69 6c 73 2e 29 0a 0a 0a 02 |re details.)....| 00000c30 35 2e 33 20 4f 74 68 65 72 20 72 65 61 64 69 6e |5.3 Other readin| 00000c40 67 20 6f 70 74 69 6f 6e 73 0a 00 0a 03 35 2e 33 |g options....5.3| 00000c50 2e 31 20 43 68 61 72 61 63 74 65 72 20 73 69 7a |.1 Character siz| 00000c60 65 0a 0a 00 54 68 65 20 6d 69 6e 69 6d 75 6d 20 |e...The minimum | 00000c70 28 04 05 6d 69 6e 00 29 20 61 6e 64 20 74 68 65 |(..min.) and the| 00000c80 20 6d 61 78 69 6d 75 6d 20 28 04 05 6d 61 78 00 | maximum (..max.| 00000c90 29 20 63 68 61 72 61 63 74 65 72 20 73 69 7a 65 |) character size| 00000ca0 73 20 6d 61 72 6b 20 74 68 65 20 6c 69 6d 69 74 |s mark the limit| 00000cb0 73 20 6f 6e 20 74 68 65 20 73 69 7a 65 20 6f 66 |s on the size of| 00000cc0 20 61 20 6d 61 72 6b 69 6e 67 20 77 68 69 63 68 | a marking which| 00000cd0 20 4f 70 74 69 63 61 6c 20 77 69 6c 6c 20 64 65 | Optical will de| 00000ce0 74 65 63 74 20 6f 6e 20 61 20 70 61 67 65 2e 0a |tect on a page..| 00000cf0 0a 41 73 20 4f 70 74 69 63 61 6c 20 77 69 6c 6c |.As Optical will| 00000d00 20 6e 6f 74 20 64 65 74 65 63 74 20 61 6e 79 74 | not detect anyt| 00000d10 68 69 6e 67 20 62 65 6c 6f 77 20 74 68 65 20 6d |hing below the m| 00000d20 69 6e 69 6d 75 6d 20 63 68 61 72 61 63 74 65 72 |inimum character| 00000d30 20 73 69 7a 65 20 28 73 70 65 63 69 66 69 65 64 | size (specified| 00000d40 20 69 6e 20 70 69 78 65 6c 73 20 2d 20 74 68 65 | in pixels - the| 00000d50 20 73 6d 61 6c 6c 20 64 6f 74 73 20 77 68 69 63 | small dots whic| 00000d60 68 20 6d 61 6b 65 20 75 70 20 61 6e 20 69 6d 61 |h make up an ima| 00000d70 67 65 29 2c 20 69 74 20 69 73 20 75 73 65 66 75 |ge), it is usefu| 00000d80 6c 20 66 6f 72 20 66 69 6c 74 65 72 69 6e 67 20 |l for filtering | 00000d90 6f 75 74 20 62 61 63 6b 67 72 6f 75 6e 64 20 6e |out background n| 00000da0 6f 69 73 65 20 2d 20 73 6d 61 6c 6c 20 73 70 75 |oise - small spu| 00000db0 72 69 6f 75 73 20 62 6c 61 63 6b 20 64 6f 74 73 |rious black dots| 00000dc0 20 66 72 6f 6d 20 64 75 73 74 20 6f 6e 20 74 68 | from dust on th| 00000dd0 65 20 70 61 70 65 72 2c 20 6f 72 20 74 68 65 20 |e paper, or the | 00000de0 73 63 61 6e 6e 65 72 20 77 69 6e 64 6f 77 20 65 |scanner window e| 00000df0 74 63 2e 0a 0a 42 79 20 61 6c 74 65 72 69 6e 67 |tc...By altering| 00000e00 20 74 68 65 20 6d 61 78 69 6d 75 6d 20 63 68 61 | the maximum cha| 00000e10 72 61 63 74 65 72 20 73 69 7a 65 2c 20 69 74 20 |racter size, it | 00000e20 69 73 20 70 6f 73 73 69 62 6c 65 20 74 6f 20 66 |is possible to f| 00000e30 69 6c 74 65 72 20 6f 75 74 20 6c 61 72 67 65 20 |ilter out large | 00000e40 6f 62 6a 65 63 74 73 20 6f 6e 20 61 20 70 61 67 |objects on a pag| 00000e50 65 20 77 68 69 63 68 20 61 72 65 20 6e 6f 74 20 |e which are not | 00000e60 74 65 78 74 20 28 73 75 63 68 20 61 73 20 73 6f |text (such as so| 00000e70 6d 65 20 67 72 61 70 68 69 63 73 2c 20 61 6e 64 |me graphics, and| 00000e80 20 76 65 72 74 69 63 61 6c 20 6f 72 20 68 6f 72 | vertical or hor| 00000e90 69 7a 6f 6e 74 61 6c 20 6c 69 6e 65 73 2e 29 20 |izontal lines.) | 00000ea0 4e 6f 74 65 20 74 68 61 74 20 6c 61 72 67 65 20 |Note that large | 00000eb0 63 68 61 72 61 63 74 65 72 73 20 28 66 72 6f 6d |characters (from| 00000ec0 20 68 65 61 64 69 6e 67 73 20 65 74 63 2e 29 20 | headings etc.) | 00000ed0 6d 61 79 20 61 6c 73 6f 20 62 65 20 69 67 6e 6f |may also be igno| 00000ee0 72 65 64 2e 0a 0a 03 35 2e 33 2e 32 20 41 63 63 |red....5.3.2 Acc| 00000ef0 75 72 61 63 79 20 2f 20 73 70 65 65 64 0a 0a 00 |uracy / speed...| 00000f00 02 00 54 68 65 20 73 6c 69 64 65 72 20 62 61 72 |..The slider bar| 00000f10 20 69 6e 20 74 68 69 73 20 61 72 65 61 20 63 61 | in this area ca| 00000f20 6e 20 62 65 20 61 64 6a 75 73 74 65 64 20 74 6f |n be adjusted to| 00000f30 20 63 6f 6e 74 72 6f 6c 20 74 68 65 20 73 70 65 | control the spe| 00000f40 65 64 20 61 74 20 77 68 69 63 68 20 4f 70 74 69 |ed at which Opti| 00000f50 63 61 6c 20 72 65 61 64 73 2c 20 61 67 61 69 6e |cal reads, again| 00000f60 73 74 20 74 68 65 20 61 63 63 75 72 61 63 79 2e |st the accuracy.| 00000f70 20 54 68 65 20 6d 6f 72 65 20 67 72 65 65 6e 20 | The more green | 00000f80 28 04 05 53 70 65 65 64 00 29 20 69 6e 20 74 68 |(..Speed.) in th| 00000f90 65 20 73 6c 69 64 65 72 2c 20 74 68 65 20 66 61 |e slider, the fa| 00000fa0 73 74 65 72 20 74 68 65 20 72 65 61 64 2e 20 54 |ster the read. 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If ..corre| 000010d0 63 74 20 00 69 73 20 61 6c 73 6f 20 73 65 6c 65 |ct .is also sele| 000010e0 63 74 65 64 20 74 68 65 6e 20 4f 70 74 69 63 61 |cted then Optica| 000010f0 6c 20 69 6e 74 65 6c 6c 69 67 65 6e 74 6c 79 20 |l intelligently | 00001100 67 75 65 73 73 65 73 20 77 68 61 74 20 61 20 6d |guesses what a m| 00001110 69 73 74 61 6b 65 20 04 73 68 6f 75 6c 64 20 00 |istake .should .| 00001120 62 65 2c 20 61 6e 64 20 72 65 70 6c 61 63 65 73 |be, and replaces| 00001130 20 69 74 2e 20 54 68 69 73 20 69 6e 63 72 65 61 | it. This increa| 00001140 73 65 73 20 74 68 65 20 61 63 63 75 72 61 63 79 |ses the accuracy| 00001150 20 6f 66 20 74 68 65 20 6f 75 74 70 75 74 2c 20 | of the output, | 00001160 62 75 74 20 73 6c 6f 77 73 20 74 68 69 6e 67 73 |but slows things| 00001170 20 64 6f 77 6e 2e 20 49 66 20 04 05 63 6f 72 72 | down. 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.