Legacy ImageMagick Discussions Archive

The error is probably sent to stderr, which is channel 2. Pick it up with:

identify -verbose file.jpg 2>result.txt

It seems to work okay for me. (Windows, 6.7.9-Q16) D:\web\im>"%IMG%convert" test.ppm test.png D:\web\im>"%IMG%convert" test.png text:- # ImageMagick pixel enumeration: 8,1,255,srgb 0,0: ( 0, 0, 0) #000000 black 1,0: ( 32, 32, 32) #202020 srgb(32,32,32) 2,0: ( 64, 64, 64) #404040 ...

IM relies on a delegate to read and write eqp files. Try the command "convert -list delegate" for a list of delegates. There should be one in there for eps files, and it will show you the command it will use (probably ghostscript). If it shows no program, or it does but the program doesn't...

Will that work for diagonal lines? Eg a line from (0,0) to (10,10) is longer than one from (0,0) to (0,10), even if they have the same number of non-aliased pixels. I would have thought the best way to estimate the length of an arbitrary curve would be to split it into segments such that each segmen...

The technique I use is to apply the same adjustments in Gimp to a gradient file, then use IM to "clut" the image with the adjusted gradient file.

It occurred to me that ffmpeg might have the ability to extract "raw" frames, that would visually show the data contained in I, B and P-frames. However, a quick look at the help ("ffmpeg -h") doesn't mean much to me. As fmw42 says, IM can easily identify what has changed between ...

I suspect a Unix escape issue. No problem in Windows, eg:

convert logo: -gravity south -annotate 0 $1billion t.png

There are a number of issues here. 1. There may be a bug in IM's resize. convert hearts.png -resize 166x165 h1.png Pixels in hearts.png that were tranparent white become transparent black in h1.png, so they all have the same colour. (This may be because they are stored as one bit in hearts.png.) Thi...

Agreed. But I think the "-combine" behaviour is wrong. It copies the pixel values from the separate greyscale files without conversion, but the resulting file (according to "identify") is sRGB.

Windows needs % to be doubled only in command files, not in direct commands at the command window. The original image is entirely black. The pretty picture is made from some of the pixels being transparent, and some opaque. The second command make all the pixels the same transparency, so it no longe...

Add -set colorspace sRGB to your command line. Which command line: the separate, combine or both? Adding it just before the "-separate" or after the "-combine" doesn't help. Adding it before the "-combine" makes it worse. The documentation (http://www.imagemagick.org/s...

"-separate" followed by "-combine" significantly lowers the middle tones of an image. For example: convert logo: log.tiff convert logo: -channel RGB -separate log_%d.tiff convert log_0.tiff log_1.tiff log_2.tiff -channel RGB -combine logCopy.tiff log.tiff and logCopy.tiff should ...

If it's helpful: a large file fails for me on my (fairly current) Q16, but succeeds on a (fairly old) Q8. D:\web\im>"%IMG%convert" BALTIMORE201210010200_21.JP2 x.jpg error: cannot decode code stream convert.exe: unable to decode image file `BALTIMORE201210010200_21.JP2' @ error/jp2.c/ReadJ...

Ah, great minds ... In theory, the tenth-size trick might generate a false positive, but it works for me.

Gimp can be used as a GUI driver for IM, rather clumsily. True, I'd like Gimp to build a batch file of IM commands that I could run at my leisure, but doing that is probably harder than making Gimp 16-bit. In the meantime, we can: 1. Use Gimp curves tool to adjust tones, colour balance etc. Then use...