Legacy ImageMagick Discussions Archive

Thanks, that's what I was looking for. Although I couldn't get -delay to work in either .gif or .mng output until I saw GeeMack's syntax being "-set delay". In many places of the documentation it's given as -delay (even the man page) and it doesn't work. I'm using version 6.8.9-9 Q16 x86_64 2016-11 ...

Hello all, it's been a while since I last did any 'advanced' IM tricks, so I'm a little rusty. I'd like to take an image and make a gif (or any video format with settable speed and looping) with that image, then that same image rotated by 360*1/n, that same image rotated by 360*2/n, ... that same ...

Thanks for the ideas. I don't actually have a sample image yet ! I'm waiting to get one (it'll be a webcam image of a dial, and I need to find the position of the needle, a call to DePolar does the 1st part of the trick).

Hello all, Say I have two points. Along the line between them most pixels are white but at a certain point there's a dark patch. How can I get the position of the peak of this dark patch ? Either in cartesian coordinates or expressed as a % along the segment. All I can think of is to get many pixel ...

THanks. I'd indeed searched for the word 'tile' in the documentation and found "-tile", but not "tile:"

Hello all, I'm trying to do something simple: tile a large area with a small image. The following command works for putting together 128x128 tiny 2x2 images in a 256x256 square: NB=128; time montage -tile $NBx$NB $( for (( c=1; c<=$((NB*NB)); c++)) ; do echo "Tiny.png" ; done ) -geometry 2x2+0+0 ...

Thanks. I'd been thinking along that, but the focus changes are annoying. Someone suggested a great method using zenity here.

Hello all, I know how I can use "display" to show an image, but I'd like to do something a little more advanced and ask the user a question, like "Is this the right image?" and get a Y/N answer. All this from a shell script. I don't see any direct way to do this in IM without a lot of clicking to ...

Sorry, it was a stupid permission problem. And yes, --verbose works with mogrify.

Hello all, I have IM running in various scripts on my Ubuntu machine and no problem. But I just tried a batch monochrome convertion and it failed: $ mogrify -verbose -monochrome 20121130-123349-00.jpg 20121130-123349-00.jpg JPEG 640x480 640x480+0+0 8-bit DirectClass 30.2KB 0.020u 0:00.019 20121130 ...

JPEG images may never be pure-greyscale!!!! Yes, that is true. I tested it on a couple thousand BW images from various sources. Obviously, single channel JPG images always have less than 256 colors. 3-channel JPGs from pure greyscale can have up to about a thousand colors in my tests. The reasons ...

You are right, your convert logo: -format "%k" info: works very well in my case.
Thanks

Thanks guys, 'format' was not what I was looking for, I should have mentioned that all images are jpg. The 'image sorting' usage info, now that's it. Why not just do a convert -scale 1x1 and see if all 3 channels are identical ? Risk of false positive ? The section about linear color seems to be ...

Hello all, I read about this recently in some IM FAQ, but tonight my google-fu must be out for a drink because I can't find the relevant info. I would like a simple way to tell if an image is grayscale or color. Bonus points if it can tell the difference between 2-color B&W, grayscale, sepia, comic ...

Hello all, I thought that using "identify file.avi" or "identify file.avi[1]" would return (among other things) the X/Y dimensions of the video. But when I type it on my Ubuntu system, all I get is the following message and then the command hangs. mplayer: could not connect to socket mplayer: No ...