Legacy ImageMagick Discussions Archive

I should warn you. One of my firsts tests with using u.p{0,0} failed. I wanted to reduce the number of images, so after I had the alpha, I added it immediatally to the original image. It sort of simplified and removed the needs for extra cloning. I Then tried to use the now fullytransparent p{0,0} ...

to recover an overlay from a series of images with mixed unknown backgrounds (img001.png-img999.png): convert img*.png -evaluate-sequence max maximage.png convert img*.png -evaluate-sequence min minimage.png check whether the background area is monochrome in both outputs, and then proceed as above ...

Great tutorial, Anthony! Some random thoughts --- convert match_burn_skyblue.png match_burn_gold.png -alpha off \ \( -clone 0,1 -compose difference -composite \ -separate -evaluate-sequence max -auto-level -negate \ \) -delete 1 -compose Copy_Opacity -composite \ xc:skyblue -fx " u.a==0 ? 0 : u...

This is an interesting problem. My attempt below does not quite work, I have not found the error yet: (edit: I think i found all errors) ----- The goal is to recover an overlay (with varying transparency alpha) , given a background and composite when the composite is white, and the background is whi...

i have not used it so far, but imagemagick supports jpeg2000.
http://www.imagemagick.org/script/jp2.php
or should do it

that is weird, it works for me. The error message indicates that mogrify cannot find any bmp files in F:\temp\out
Well, if the second command works...

I am trying to convert a folder full of BMP images to TIFF. They are individual frames from a movie. ... I have tried a number of commands but the one i really thought would work is this mogrify -format bmp *.tiff which gives me this error Magick: unable to open image `*.tiff': Invalid argument @ e...

That is, if the star was 50% transparent, and overlaid on the fully opaque dragon image, then you get the same result as the above. So what if the image being overlaid was semi-transparent to begin with? As far as I can tell, the method above works all right if the overlaid image contains semi-tran...

Good result Hugo and yes you have to use " not ' with windows. http://www.imagemagick.org/Usage/windows/ Thanks! I forgot about that. There really should be a warning if there are unparseable options passed to imagemagick Anyway, the general case: to undo a composite -dissolve X fileA.png file...

Eureka! Apparently the single quotes ' do not work in the -define compose:args='0,-1,2,0' under windows. With double quotes it works as intended. This may be a bug with windows or with imagemagick, not sure to undo a 50% dissolve ( composite -dissolve 50 -gravity South star.gif dragon_sm.gif combine...

check out http://www.imagemagick.org/Usage/channels/#zeroing http://www.imagemagick.org/Usage/channels/#combine_other http://www.imagemagick.org/Usage/compose/#multiply basically you need to select the saturation channel with -colorspace HSL -channel G then multiply the channel with a gradient mask ...

I am looking for a way to "undo" this opperation: composite -dissolve 50 -gravity South star.gif dragon_sm.gif combine.png 50% http://www.imagemagick.org/Usage/compose/star.gif [over] http://www.imagemagick.org/Usage/compose/dragon_sm.gif = http://img852.imageshack.us/img852/6153/testv.png...

Thanks! Can I somehow apply that to all files in a directory with mogrify *.jpg? something like mogrify -quality 50% -define jpeg:extent $EXISTING_SIZE *.jpg Ideally I would want to leave files with lower compression level totally untouched, not recompressing them to stay at the same size. I suppose...

Hi, Is there a way to tell mogrify to change the "-quality" compression level only if the image does not already have a lower quality setting? i.e. > mogrify -quality 50% *.jpg should leave files that are already compressed at quality 20% untouched. Or in other words, if the file size woul...

When operating on an image sequence, and adding a border to the last image of the sequence, the -border switch randomly changes colors of that image, if certain preconditions are met. Strongly simplified example: convert logo: ( -clone 0 -bordercolor green -border 10x10 ) +append test.png http://img...