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0
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1answer
5 views

How do I make weighed average (using alhpa channel as weight) of pictures?

I have multiple similar pictures I want to make aveage of, but not uniformatically. Each zone in pictures should have separate weight, and the weight is encoded in alhpa channel (fully transparent - ...
1
vote
1answer
85 views

How to display a picture and print pixel coordinates when I click?

When using ImageMagick or similar command line tools it can be useful to know coordinates of some points in the image. How to display an image (with panning and zooming) and print coordinates of ...
0
votes
1answer
971 views

How to auto-trim scanned images using imagemagick or graphicsmagick?

I've got some scanned images in *.jpg format. They are scanned using A4 scanner, in greyscale or colour. Scanned pages have very different dimensions - some A5, some A6, some business cards etc. ...
3
votes
1answer
178 views

transparent gradients with graphicsmagick

I'm trying to create a gradient that goes from transparent to some color. With imageMagick you can do that with (taken from the documentation): convert -size 100x100 gradient:none-firebrick ...
0
votes
1answer
276 views

Is there a GraphicsMagick equivalent to ImageMagick's image stack?

Although GraphicsMagick is a fork of ImageMagick, there are dissimilarities between the two, namely in the support of image stacking in ImageMagick, but not in GraphicsMagick. Taken from the ...
0
votes
1answer
507 views

How to create a transparent image with GraphicsMagick CLI?

I'm coming up empty handed while trying to find out how to modify the opacity of an image using the GraphicsMagick CLI. I'm simply trying to input a standard image and convert it to the corresponding ...
4
votes
3answers
4k views

How do I change the canvas size of a PNG with ImageMagick (GraphicsMagick)? (How to pad with transparency?)

Alternatively: How do I take a non-square PNG and "fill out" the "rest" of the image with transparency so that the resulting square image has the original image centered in the square? ULTIMATELY, ...
0
votes
1answer
448 views

Why does gm always export all layers of the input image?

Given the following command line: '/usr/bin/gm' convert 'directory/filename.psd[0]' filename.jpg I will always receive all layers from the .psd as output: $ ls something* something.jpg.0 ...