Legacy ImageMagick Discussions Archive

The "magic number" for an ICO file is hex 0001. That's not much to go by. Lots of files could begin with those four bytes.

Did you try BMP4?

Did you try to force IM to write the image in the BMP3 format?

By the way, "-depth 32" means RGBA with 32 bits per channel (128 bits per pixel) which isn't what you want.

Of those I prefer "LABEL:". So the image in question would be stored with the property "LABEL:VERSION= 1.8", "LABEL:CREATOR:= SCREENSHOT_STUDIO", etc. grep "comment" coders/*.c grep "label" coders/*.c' says this will be a fairly extensive job. Lots o...

The VERSION keyword was invented by the author of the image, not by libpng. PNG text keywords can consist of any string of 1-79 Latin-1 characters. We'll need to find another way of storing comment keywords coming from PNG, GIF, JPEG, etc., images or from the "-label" or "-comment&quo...

I don't see "-grayscale <colorspace>" listed among the commandline options at http://imagemagick.org/script/command-l ... php#option (although "-grayscale <method>" does show up on the help screen if I type "magick convert").

Aren't you simply overflowing your own "itypes[]" array, when i exceeds 3?

EDIT: never mind, I see you are restarting i==0 each time around your loop.

I can't reproduce this problem on my platform (Ubuntu 14.04, IM-7.0.1-6-Q16). I get the same transparent image out. IM does add some ancillary chunks, including a white bKGD chunk, but those are OK. Can you post the result of pngcheck -v PNG_transparency_demonstration_1_why_black.png Here's mine: Fi...

Instead of "-colorize r,g,b", try "-fill newcolor -opaque oldcolor"

Sorry but I'm not aware of any binary distribution of ImageMagick for AIX. What version of IM did you download, that has the unexpected ";"?

The "not working" one ends with convert: unable to load module 'C:\Program Files\ImageMagick-7.0.1-Q16\modules\c oders\IM_MOD_RL_png_.dll': Nie można odnaleźć określonego modułu. @ error/module.c/OpenModule/1275. convert: no encode delegate for this image format `PNG32' @ warning/constitut...

Does the "-debug" output give you anything helpful? or

What does tell you about your installed libpng version?

Don't use "PNG8:" because that forces a bit-depth of 8. Try this: convert test.png -colors 4 \ -define png:color-type=3 \ -define png:bit-depth=2 \ -define png:exclude-chunk=bKGD \ test5.png (excluding the bKGD to prevent your image from having 5 colors, that won't fit in a 2-bit palette)

It ignored the "convert to PGM" directive because of the "gray:" prefix you supplied in the output filename.