Damien Dunlop on wrote...
| > | b) Another program is 70 times faster doing the same.
| > |
| > But it is not as general, batch drivable, and it is not free either!
|
| No, I mean yes, I agree. I was just using it as an example to
| indicate there must be something not quite right. I am sure there
| are bugs in IM like every other software, including Paint Shop Pro.
|
Yes and I have a feeling IM is over doing the quantization needed
when you have an input of millions of colors, but only 255 color output.
It makes a tree to try to find color groups (or color segments) and it
may be that this tree is going much to far for the very limited set of
colors needed.
A random set of colors of course would be hardest of all as with that
many you would start to get very uniform color distribution, making it
hard to quantize.
| Incidently, the post `Colour Confusion' operation does not
| involve distortion, just appending.
|
And each append would add a whole new set of colors. But it shouldn't
take a lot of work...
Mind you GIF is not a good file format for images larger than 200x200
pixels, and then only when they are very 'cartoon' like. Other formats
are much better for this. But then you have a historical backlog!
| I checked the palettes:
|
| PSP palette after rotation = palette before rotation
| Im palette after rotation has only one colour in
| common with the palette before rotation - so lots of
| changing going on.
|
| I must look at a rotated `quality' image to determine if
| I can notice the difference between PSP and IM.
|
| With the -taint and -sample, palette after = palette before
| as you implied.
-taint is a the same as -noop, but marks the image as 'modified'.
It is used to ensure that IM does not just do a direct delegate
conversion, but actually reads the images into and out of memory.
-sample is a resize without adding colors, but leaves images either
aliased (on reduction) or pixelated (on enlargement).
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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"It's a shame that you do not like what you have created!"
--- Jobe -- "The Lawnmower Man" - Steven King
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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