!AWFeb93/Goodies/Imagery/!TinyImage/Tutorial

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Archimedes archive » Acorn Computing » 1993 01 Mega Disk.adf » !_93_01 » Imagery/!TinyImage/Tutorial
Archimedes archive » Archimedes World » AW-1993-02.adf » AWFeb93 » !AWFeb93/Goodies/Imagery/!TinyImage/Tutorial

Imagery Tutorial - John Whigham - 11/06/92
------------------------------------------


Introduction
------------

This section of the manual provides you with a blow-by-blow account of the
creation of a picture using Imagery. It is hoped that this may give you some
idea of what can be achieved and may make your first attempts as using the
package somewhat easier.

------------

The first thing you might like to decide upon when about to embark upon your
first masterpiece is what exactly it is that you are going to draw. Some
people like to just start and see what developes from there but, lacking any
real artistic flair, I decided to look about for inspiration and soon found
a nice airbrushed painting of a jukebox.

One nice feature that the jukebox possesed was that it was largely
symmetrical, which meant that I could draw just one half of it, which I
could then mirror across to make up the other half, therefor saving myself
both some time and effort.

Having my inspiration and software handy, it was time to put pen to paper,
or at least mouse to mousemat. The first thing I did was to use the "SET
FRAME" feature from the "SPECIAL" menu to create a frame the same height as
the picture but just half the width, I then placed this so its left edge lay
along the leftmost edge of the picture, this then gave me a line down the
screen exactly half way accross the picture. I needed this so that I could
draw whatever I liked on one side, the left say, and then mirror it onto the
right side where it would fit perfectly, leaving the finished picture
central on the screen.

Next came a basic outline of the jukebox, scene (1) shows what I came up
with, I used the "WIRE ARC" shapes function to draw the curves for the top
while the "RUBBER LINE" paint option was used to draw most of the other
lines. The "PIXELS" paint option, when used in conjunction with the "ZOOM"
facility, is useful for tidying up stray lines and pixels.

Scenes (2), (3) and (4) show more detail being added to this basic outline.
Again, most of this work was done with the "RUBBER LINE" function although
such features as "SKETCH", "WIRE RECTANGLE" and "WIRE ARC" were also used at
times. Remember that all the painting functions operate in conjunction with
the "ZOOM" feature so for fine detail, working at a magnification of 2 or 4
times may help.

Scene (5) shows the interior of the top section shaded. This would be quite
tricky and time consuming if we were working with paints and brushes, but
the beauty of computer art is that often the computer can be made to do the
hard work for you, this is one such case. I started by filling the area
using the "PATTERN FILL" function which can be found via the "FILL" submenu
of the "PAINT" menu structure. I selected the triangle pattern for the
simple reason that I liked the look of it. Once the area was filled with
this pattern, which is made up of two colours, I defined two graduated fills
using the "GRADUATED FILLS" editor accessed via the "EDIT" menu structure.
One fill used only two shades of red while the other was a graduation from
orange to red using eight shades. I made all the colours transparent with
the "SET TRANSPARENTS" paint option then made one of the two colours used in
the triangle pattern solid again. An area graduated fill over this area with
the red fill defined earlier then gave this one colour a nice red shade. The
other colour used in the pattern was then made solid and the first
transparent again. A second area fill with the orange-red fill completed the
effect shown in the scene.

Next I decided to fill some of the other areas using the graduated fill
function. This function is very useful for people such as myself who are not
overly blessed with artistis talent as it allows quite proffesional results
to be obtained quickly and with relativly little fuss. One method which I
found useful for filling areas where the area to be filled is broken up by
other parts of the picture is to use the flood fill on the areas to be
filled with an unused colour and then to make all bar this colour
transparent. A graduated area fill can then be used enclosing all the
sections of the area which will ensure an even colour graduation over all
the areas. This trick can also be quite useful when using a graduated flood
fill, if you fill the area with plain colour first, it can help to see just
where exactly the graduated fill is going to cover.

Scene (6) shows some of the area of the jukebox filled with plain colour,
ready for the graduated fill. One point to note here is that I filled in
some of the white outlines with the colours before using the graduated fill,
otherwise all my nice colours would be bounded by white lines - not exactly
what I was looking for. Scene (7) shows some of the flat colours replaced
with graduated fills, a definite improvement I think.

Next came some more fills with both graduated and flood fills, as shown in
scene (8). Again it was important to remove the white lines from around the
swirly patterns on the front pannel of the jukebox, some use was made of the
"COLOUR REPLACE" function from the "SPECIAL" menu here to replace the white
pixels with the green I was using to fill the patterns.

The patterns were filled using a similar process to that described above for
the interior of the top section. An area fill had to be used because the
patterns did not connect, all bar the green colour were made transparent to
achieve this. The triangle pattern fill was used again followed by a pair of
graduated fills - one for each pattern colour as shown above. Scene (9)
shows the final effect.

Scenes (10) upto (17) show how the picture progressed from there. Most of
the work was just using graduated and flood fills to fill in the areas
originally drawn as white outlines. The stack of records were initially
drawn as a stack of alternating grey and black lines with the bottom one
being a little thicked to form the turntable. The grey lines were then
filled using a horizontal graduated fill which was made up of sixteen
varying shades of grey and white to create the effect shown.

Scene (17) shows the finished jukebox, or rather half of it. The picture
still only shows the left half of the jukebox so I thought it was about time
to see about filling that blank right hand side of the picture. This was
achieved using the "COPY AREA" function provided by the "MANIPULATE" menu
structure. The left side of the jukebox was selected then the "X FLIP"
option was selected from the area control dialogue box before pasting the,
now mirrored, half jukebox onto the right hand edge of the half that was
already there, hey presto - one complete jukebox!

A few minor touches finished off the jukebox itself but, not withstanding
any lack of talent, I decided to create a scene for my musical masterpiece.
First I decided to export the entire jukebox as a sprite with a mask to
replace the black background. This would let me paste it straight into
whatever scene I came up with. The problem was that I could not just make
the background black transparent as black was also used within the jukebox
itself and these bits would also go transparent when exported. The answer
was to draw round the jukebox using an unused colour, in this case a bright
pink, and the "PIXEL" function. The picture was magnified eight times to
make this easier. Once I had an outline, I could flood fill the background
with the same pink colour which I could then make transparent for the
exporting. The "EXPORT" function from the "FILE" menu was selected next and
the entire jukebox selected with the "MASK" option of the area control
dialogue box on to make sure a mask was generated from the transparent pink
colour.

I could now start work on the background for my jukebox. I decided to do
something a little different with this and so opted for a somewhat sureal
scene of the jukebox rising out of some rippling watter. Scene (19) shows
the basic background for the scene. I started by drawing the rocks about
halfway up the screen. These were created by drawing their outlines using a
dark grey colour and the "RUBBER LINE" function. They were then filled with
a plain flood fill before using the "PIXELS", "SKETCH" and "AIRBRUSH"
functions to add the surace details. The silver tree was drawn in the same
way with a small "PAINTBRUSH" being used for the leaves.

I then used the "RUBBER LINE" function again to draw an outline of mountains
in the background aswell as the gnarled tree silhouetes. The area above this
outline was then flood filled with white to give the scene shown in scene
(19).

One graduated area fill later and I had scene (20) with a nice blue dawn
sky. I wanted to put a planet of some sort against the left hand side of the
sky and toyed with the idea of putting a shaded sphere there to represent it
but then decided against this, it would be simple to do but would not look
all that much like a planet. Instead I used a small program that I had to
generate a gas-planet type effect on a circle, I saved the output from the
program as a sprite with a mask to cover the black background and then
simply dragged this onto the picture to give the scene in scene(21).

For the water effect, I copied everything from the rocks upwards using the
"COPY AREA" manipulation function with the "X FLIP" option set to invert the
image before plotting it inplace of the black area at the bottom of the
picture. I wanted to give the effect of the jukebox being about half
submerged in the water so I went back to my jukebox sprite I exported
earlier and used paint to remove the bottom half of the sprite.

This edited sprite was then dragged back onto the picture and plotted at
half height and inverted to create the proposed reflection of the jukebox in
the water. Scene (22) shows the image as it then stood.

The water did not look very realistic, reflections in water are not usually
as bright as the original and are rarely perfectly flat. To address the
first problem, I selected a light blue colour and used the "TINT AREA"
function from the "SPECIAL" menu to give the water a more blue hue, as shown
in scene(23). The colour now looked about right but the reflections were
still perfectly flat. To the rescue came the "WOBBLE" function from the
"MANIPULATE" menu. This function can be a little tricky to control exactly
what effect will be created but with a little experimentation and repeated
use of the "SHOW" option, I managed to come up with quite a good ripple
function - as shown in scene(25). This function was applied to the entire
water area to create quite a pleasant looking water effect.

To complete the picture, all that was required was to import the sprite
containing the top half of the jukebox again and plot it to line up with the
reflection plotted earlier. Scene(24) shows the final picture, tentativly
titled "Coin-op Water Music"!

---------------

We hope that this walkthrough of the creation of a picture has given you
some ideas of what can be achieved using just a few of the facilities
provided by Imagery and has shown you that you don't need to be an artistic
genius to create quite pleasing results quickly and easily.

Good Luck!

00000000  49 6d 61 67 65 72 79 20  54 75 74 6f 72 69 61 6c  |Imagery Tutorial|
00000010  20 2d 20 4a 6f 68 6e 20  57 68 69 67 68 61 6d 20  | - John Whigham |
00000020  2d 20 31 31 2f 30 36 2f  39 32 0a 2d 2d 2d 2d 2d  |- 11/06/92.-----|
00000030  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
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00000060  74 69 6f 6e 0a 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |tion.-----------|
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00000830  73 75 63 68 20 66 65 61  74 75 72 65 73 20 61 73  |such features as|
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00000860  22 57 49 52 45 20 41 52  43 22 20 77 65 72 65 20  |"WIRE ARC" were |
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00000880  65 73 2e 20 52 65 6d 65  6d 62 65 72 20 74 68 61  |es. Remember tha|
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000008d0  4f 4d 22 20 66 65 61 74  75 72 65 20 73 6f 20 66  |OM" feature so f|
000008e0  6f 72 20 66 69 6e 65 20  64 65 74 61 69 6c 2c 20  |or fine detail, |
000008f0  77 6f 72 6b 69 6e 67 20  61 74 20 61 20 6d 61 67  |working at a mag|
00000900  6e 69 66 69 63 61 74 69  6f 6e 20 6f 66 20 32 20  |nification of 2 |
00000910  6f 72 20 34 0a 74 69 6d  65 73 20 6d 61 79 20 68  |or 4.times may h|
00000920  65 6c 70 2e 0a 0a 53 63  65 6e 65 20 28 35 29 20  |elp...Scene (5) |
00000930  73 68 6f 77 73 20 74 68  65 20 69 6e 74 65 72 69  |shows the interi|
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00002650  61 73 20 69 74 20 74 68  65 6e 20 73 74 6f 6f 64  |as it then stood|
00002660  2e 0a 0a 54 68 65 20 77  61 74 65 72 20 64 69 64  |...The water did|
00002670  20 6e 6f 74 20 6c 6f 6f  6b 20 76 65 72 79 20 72  | not look very r|
00002680  65 61 6c 69 73 74 69 63  2c 20 72 65 66 6c 65 63  |ealistic, reflec|
00002690  74 69 6f 6e 73 20 69 6e  20 77 61 74 65 72 20 61  |tions in water a|
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000026b0  73 20 62 72 69 67 68 74  20 61 73 20 74 68 65 20  |s bright as the |
000026c0  6f 72 69 67 69 6e 61 6c  20 61 6e 64 20 61 72 65  |original and are|
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000026f0  73 73 20 74 68 65 0a 66  69 72 73 74 20 70 72 6f  |ss the.first pro|
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00002730  65 20 22 54 49 4e 54 20  41 52 45 41 22 0a 66 75  |e "TINT AREA".fu|
00002740  6e 63 74 69 6f 6e 20 66  72 6f 6d 20 74 68 65 20  |nction from the |
00002750  22 53 50 45 43 49 41 4c  22 20 6d 65 6e 75 20 74  |"SPECIAL" menu t|
00002760  6f 20 67 69 76 65 20 74  68 65 20 77 61 74 65 72  |o give the water|
00002770  20 61 20 6d 6f 72 65 20  62 6c 75 65 20 68 75 65  | a more blue hue|
00002780  2c 20 61 73 20 73 68 6f  77 6e 0a 69 6e 20 73 63  |, as shown.in sc|
00002790  65 6e 65 28 32 33 29 2e  20 54 68 65 20 63 6f 6c  |ene(23). The col|
000027a0  6f 75 72 20 6e 6f 77 20  6c 6f 6f 6b 65 64 20 61  |our now looked a|
000027b0  62 6f 75 74 20 72 69 67  68 74 20 62 75 74 20 74  |bout right but t|
000027c0  68 65 20 72 65 66 6c 65  63 74 69 6f 6e 73 20 77  |he reflections w|
000027d0  65 72 65 0a 73 74 69 6c  6c 20 70 65 72 66 65 63  |ere.still perfec|
000027e0  74 6c 79 20 66 6c 61 74  2e 20 54 6f 20 74 68 65  |tly flat. To the|
000027f0  20 72 65 73 63 75 65 20  63 61 6d 65 20 74 68 65  | rescue came the|
00002800  20 22 57 4f 42 42 4c 45  22 20 66 75 6e 63 74 69  | "WOBBLE" functi|
00002810  6f 6e 20 66 72 6f 6d 20  74 68 65 0a 22 4d 41 4e  |on from the."MAN|
00002820  49 50 55 4c 41 54 45 22  20 6d 65 6e 75 2e 20 54  |IPULATE" menu. T|
00002830  68 69 73 20 66 75 6e 63  74 69 6f 6e 20 63 61 6e  |his function can|
00002840  20 62 65 20 61 20 6c 69  74 74 6c 65 20 74 72 69  | be a little tri|
00002850  63 6b 79 20 74 6f 20 63  6f 6e 74 72 6f 6c 20 65  |cky to control e|
00002860  78 61 63 74 6c 79 0a 77  68 61 74 20 65 66 66 65  |xactly.what effe|
00002870  63 74 20 77 69 6c 6c 20  62 65 20 63 72 65 61 74  |ct will be creat|
00002880  65 64 20 62 75 74 20 77  69 74 68 20 61 20 6c 69  |ed but with a li|
00002890  74 74 6c 65 20 65 78 70  65 72 69 6d 65 6e 74 61  |ttle experimenta|
000028a0  74 69 6f 6e 20 61 6e 64  20 72 65 70 65 61 74 65  |tion and repeate|
000028b0  64 0a 75 73 65 20 6f 66  20 74 68 65 20 22 53 48  |d.use of the "SH|
000028c0  4f 57 22 20 6f 70 74 69  6f 6e 2c 20 49 20 6d 61  |OW" option, I ma|
000028d0  6e 61 67 65 64 20 74 6f  20 63 6f 6d 65 20 75 70  |naged to come up|
000028e0  20 77 69 74 68 20 71 75  69 74 65 20 61 20 67 6f  | with quite a go|
000028f0  6f 64 20 72 69 70 70 6c  65 0a 66 75 6e 63 74 69  |od ripple.functi|
00002900  6f 6e 20 2d 20 61 73 20  73 68 6f 77 6e 20 69 6e  |on - as shown in|
00002910  20 73 63 65 6e 65 28 32  35 29 2e 20 54 68 69 73  | scene(25). This|
00002920  20 66 75 6e 63 74 69 6f  6e 20 77 61 73 20 61 70  | function was ap|
00002930  70 6c 69 65 64 20 74 6f  20 74 68 65 20 65 6e 74  |plied to the ent|
00002940  69 72 65 0a 77 61 74 65  72 20 61 72 65 61 20 74  |ire.water area t|
00002950  6f 20 63 72 65 61 74 65  20 71 75 69 74 65 20 61  |o create quite a|
00002960  20 70 6c 65 61 73 61 6e  74 20 6c 6f 6f 6b 69 6e  | pleasant lookin|
00002970  67 20 77 61 74 65 72 20  65 66 66 65 63 74 2e 0a  |g water effect..|
00002980  0a 54 6f 20 63 6f 6d 70  6c 65 74 65 20 74 68 65  |.To complete the|
00002990  20 70 69 63 74 75 72 65  2c 20 61 6c 6c 20 74 68  | picture, all th|
000029a0  61 74 20 77 61 73 20 72  65 71 75 69 72 65 64 20  |at was required |
000029b0  77 61 73 20 74 6f 20 69  6d 70 6f 72 74 20 74 68  |was to import th|
000029c0  65 20 73 70 72 69 74 65  0a 63 6f 6e 74 61 69 6e  |e sprite.contain|
000029d0  69 6e 67 20 74 68 65 20  74 6f 70 20 68 61 6c 66  |ing the top half|
000029e0  20 6f 66 20 74 68 65 20  6a 75 6b 65 62 6f 78 20  | of the jukebox |
000029f0  61 67 61 69 6e 20 61 6e  64 20 70 6c 6f 74 20 69  |again and plot i|
00002a00  74 20 74 6f 20 6c 69 6e  65 20 75 70 20 77 69 74  |t to line up wit|
00002a10  68 20 74 68 65 0a 72 65  66 6c 65 63 74 69 6f 6e  |h the.reflection|
00002a20  20 70 6c 6f 74 74 65 64  20 65 61 72 6c 69 65 72  | plotted earlier|
00002a30  2e 20 53 63 65 6e 65 28  32 34 29 20 73 68 6f 77  |. Scene(24) show|
00002a40  73 20 74 68 65 20 66 69  6e 61 6c 20 70 69 63 74  |s the final pict|
00002a50  75 72 65 2c 20 74 65 6e  74 61 74 69 76 6c 79 0a  |ure, tentativly.|
00002a60  74 69 74 6c 65 64 20 22  43 6f 69 6e 2d 6f 70 20  |titled "Coin-op |
00002a70  57 61 74 65 72 20 4d 75  73 69 63 22 21 0a 0a 2d  |Water Music"!..-|
00002a80  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 0a 0a  |--------------..|
00002a90  57 65 20 68 6f 70 65 20  74 68 61 74 20 74 68 69  |We hope that thi|
00002aa0  73 20 77 61 6c 6b 74 68  72 6f 75 67 68 20 6f 66  |s walkthrough of|
00002ab0  20 74 68 65 20 63 72 65  61 74 69 6f 6e 20 6f 66  | the creation of|
00002ac0  20 61 20 70 69 63 74 75  72 65 20 68 61 73 20 67  | a picture has g|
00002ad0  69 76 65 6e 20 79 6f 75  0a 73 6f 6d 65 20 69 64  |iven you.some id|
00002ae0  65 61 73 20 6f 66 20 77  68 61 74 20 63 61 6e 20  |eas of what can |
00002af0  62 65 20 61 63 68 69 65  76 65 64 20 75 73 69 6e  |be achieved usin|
00002b00  67 20 6a 75 73 74 20 61  20 66 65 77 20 6f 66 20  |g just a few of |
00002b10  74 68 65 20 66 61 63 69  6c 69 74 69 65 73 0a 70  |the facilities.p|
00002b20  72 6f 76 69 64 65 64 20  62 79 20 49 6d 61 67 65  |rovided by Image|
00002b30  72 79 20 61 6e 64 20 68  61 73 20 73 68 6f 77 6e  |ry and has shown|
00002b40  20 79 6f 75 20 74 68 61  74 20 79 6f 75 20 64 6f  | you that you do|
00002b50  6e 27 74 20 6e 65 65 64  20 74 6f 20 62 65 20 61  |n't need to be a|
00002b60  6e 20 61 72 74 69 73 74  69 63 0a 67 65 6e 69 75  |n artistic.geniu|
00002b70  73 20 74 6f 20 63 72 65  61 74 65 20 71 75 69 74  |s to create quit|
00002b80  65 20 70 6c 65 61 73 69  6e 67 20 72 65 73 75 6c  |e pleasing resul|
00002b90  74 73 20 71 75 69 63 6b  6c 79 20 61 6e 64 20 65  |ts quickly and e|
00002ba0  61 73 69 6c 79 2e 0a 0a  47 6f 6f 64 20 4c 75 63  |asily...Good Luc|
00002bb0  6b 21 0a                                          |k!.|
00002bb3

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