Legacy ImageMagick Discussions Archive

That makes sense, thanks for the info. There are 7 control points in Shepards distortion, where the 4 corner points are fixed (input = output) and 3 points are moved (left-center, center-center, right-center). I think I need all of these 7 points to obtain the distortion that I need. Further ideas ...

Hello, I am facing performance issues on large RGB files (example 20000px by 12000px). The Shepards distort takes >30 minutes to process such kind of files. I have tried with TIF format (with and without LZW compression) as well as PSD file format. Also tried Q8 version of ImageMagick but the ...

sorry, couldn't make it work at all using -distort Perspective. Somehow it doesn't keep the corner points and the desired effect (warp curve) isn't applied. Can you provide me an example command to get something similar as in my previous post where Shepards and Photoshop Warp are compared? Many ...

I am actually comparing it to Photoshop's Free Transform option using the "Warp" button. Here's what ImageMagick would deliver if I did a centric Shepards move with 4 fixed points (corners) and 3 move points (center-left, center-center, center-right): https://www.dropbox.com/s/l9bs03bua1yu9e0/IM ...

Hello, Tried to use the -distort function with Shepards (taffy-like) approach to move the area around certain control points. As per Shepards and as perfectly explained in the examples section, the transformation does "...it a bit like those 'pins' at the control points are not actually round pins ...

Great, worked fine. Thanks. Even preserved the embedded ICC profile.

Hi, I created a 2 pixel file in RGB, 8bit, TIFF format, sRGB ICC profile embedded, with one pixel being RGB 0,0,0 and the other one RGB 255,255,255. If I use following command the resulting output TIF file is converted to Grayscale: convert RGB-black-and-white-pixel.tif RGB-black-and-white-pixel_out ...

Thanks, snibgo
Didn't know that

"-colors N" guarantees the result will have no more than N colours, but it does NOT guarantee any particular minimum.

Your loop process sounds like a good idea.

Hello, I encounter an issue when trying to index a gradient file in RGB 8bit with following command line: convert -verbose Gradient.tif -dither none -colors 21 Gradient.png I get the verbose information that the resulting png file only contains 16 colors, not 21 as specified. If I use a larger ...

Resolved myself using the grep command: magick -verbose image.png info:- | grep -A 10 -i colormap: > image.txt This just extracts the 10 lines after the colormap entry in the info sequence. Unless anyone has a more elegant solution that dynamically extracts the colormap information only indpendently ...

Thanks! That almost does what I need. magick r.png -colors 16 -verbose info:r.txt ...exports a text file including all the image information as obtained with the identify -verbose command. How can I reduce this information to contain only the section within your "code" example? I probably didn't ...

I always get the histogram list instead of the colormap list (see above). How can I extract this section from -verbose and write it into a text file?: Colormap: 0: (133,114,144,255) #857290FF srgba(133,114,144,1) 1: ( 80, 67, 80,255) #504350FF srgba(80,67,80,1) 2: (152,144,175,255) #9890AFFF srgba ...

Hello, when using identify -verbose image.png for an indexed image, I get following information: [...] Colors: 10 Histogram: 1689805: ( 62, 55, 61) #3E373D srgb(62,55,61) 891326: ( 68, 65, 96) #444160 srgb(68,65,96) 531139: ( 80, 67, 80) #504350 srgb(80,67,80) 502187: ( 94, 80,105) #5E5069 srgb(94 ...