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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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As a simple test, I did convert aircon. It works for me, without negate. More detail for you. I presume you adjusted the threshold factor to suit your image.

Questions and postings pertaining to the usage of ImageMagick regardless of the interface. Use the lowest value that works adequately. Your method will recreate the alpha via -transparent white and will have more stair-stepped aliasing.

Inverting an Image with Image Magick –

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Invert colors with ImageMagick Ask Question. If I make a slightly more thorough test and try a different gradient of red-yellow: How do I invert the colors of an image using the ImageMagick convert tool, so that black becomes white and white becomes black?

Just a guess until I can see your actual input files. Stack Overflow works best with JavaScript enabled. Post as a guest Name. I tried negating the whole image before rotating the hue, but that didn’t produce the expected result. The transparency problem is because the alpha channel is also inverted.

Which are your desired results? How was negate failing?

Negate (invert) only black and white? – ImageMagick

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand imagemagixk your continued use of the website is subject to these nivert. Can you post an example image and explain what you want to happen or show a result from using GIMP? The issue is that you need to specify alpha values in your colors, since your image imagemsgick transparency. However, my first method should give better antialiasing, since it keeps your original alpha channel.

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. In ImageMagick, I’ve found that the following two commands do what I want: All of them result in a purely black image.

My image, and the expected result: Most algorithms update the red, green, blue, black for CMYKand alpha channels. I’m not sure what explains the different behavior. Jo Liss 1, 1 12 If you had provided the original image first, I would not have put the blur in. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Try the following now. Email Required, but never shown. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.