Can ImageMagick negate only non-saturated colors (black, white, and gray)? I tried negating the whole image before rotating the hue, but that. Three ways to invert an image: convert -negate source:http:// Date Tue 30 October Tagsphotography / invert image / image magick I already posted about image magick before but since this time I actually needed to.
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Example each column contains the same picture, just with different backgrounds. I’m not sure what explains the different behavior. I tried negating the whole image before rotating the hue, but that imagemagivk produce the expected result. Sign up using Email and Password.
Sign up using Email and Password. All of them result in a purely black image. I have a large number of images that are white with transparent backgrounds, and I would like to make them black with transparent backgrounds. I need separate files.
Sign up or log in Sign up using Google. In ImageMagick, I’ve found that the imagdmagick two commands do what I want: Email Required, but never shown.
Stack Overflow works best with Imagemagiick enabled. Sign up using Email and Password. If you post a link to your input image, we can try to test with it and provide the commands. But mogrify does not accept -compose over. In ImageMagick, I’ve found that the following two commands do what I want:.
Amini 5 5. If not please post your input and GIMP output. So, if I make a 4×1 pixel mini colour-swatch going from blue to magenta in 3 equal steps like this and dump it as text:. How come the negative of white didn’t come out black? Which are your desired results? Questions and postings pertaining to the usage of ImageMagick regardless of the interface.
I think all your numbers should be However, my first method should give better antialiasing, since it keeps your original alpha channel.
More detail for you. What I’m curious about though is: What do each of your columns represent? Sign up or log in Sign up using Google.
Inverting an Image with Image Magick –
I guess I do not understand the issue. Usability of -negate seems to be sacrificed for overall consistency. Last edited by imek on Thu Dec 05, 7: Also, what OS are you using and iinvert the objection to two passes?
The transparency problem is because the alpha channel is also inverted. See also the documentation for -negate. I presume you adjusted the threshold factor to suit your image. Another method similar to the first is just to make the whole underlying image black and keep the alpha channel.