Legacy ImageMagick Discussions Archive

Oh wow - perfect - thank you! I had not looked into FFT - but have definitely reviewed everything I could find you've written re Morphology. I had actually explored HMT for a bit to deal with something way earlier in the process, but ultimately took a different approach and forgot about it. This is ...

Hello, I have monotone images being generated outside of IM, and contain what's effectively the "ordered-dither=checks" dithering. I've been trying to figure out a way to remove such dithering - what I'd like is to make any/all instances of such dithering fully black. Example file is (Grou...

Update: I was finally able to work out exactly what I needed. Many thanks to those who helped and helped guide me to the solution I needed. In running tests across many, many thousands of PDFs, I kept getting inconsistent results for what I was trying to accomplish. This was no fault of ImageMagick ...

This is a common task in image processing: find some visual characteristic that isolates the feature we want. Yes, indeed. It is really fascinating. I never fully understood just how much could be done with imagemagick - it's incredible - opened a whole new world. Once I'm done with this latest adv...

This works absolutely brilliantly. Thank you! I'm going to kick the tires on it some more. I've also been trying to figure out something fmw42 mentioned in another thread, when I first realized I need to account for color. https://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=19580&am...

Thank you so much - this is extremely helpful. I'm still working with your feedback, and ensuring I fully understand before asking any further questions. Re the Top Secret vs Sample - I had initially been focusing on this from a "gray" angle (the "Top Secret", even though I reali...

if I do an RGB sampling of the "Top Secret" gray text on the image, it is "203,203,203" in this one image (testpdf_grays64.png), Your image has 16 bits/channel/pixel, so values are from 0 to 65535. Your sampling software rounds this to 8 bits, ie out of 0 to 255. Rounding could ...

One additional question: How do I factor in the fact that most of the "source" files also have an alpha layer? I've uploaded an example: samplepdf0001.pdf (plus the identity verbose output). If I run: magick identify -verbose samplepdf0001.pdf > samplepdf0001.txt And then look at the histo...

Please note - for all below examples, I'm using Version: ImageMagick 7.0.8-40 Q16 x64 2019-04-13 When I convert testpdf_grays.pdf to png: i.) If I use the following command, the resulting PNG is saved as "Grayscale". magick convert -density 72 "testpdf_grays.pdf" -background whit...

Thank you a million times over! This definitely helps point me in the right direction. It may also be exactly the solution - however, I'm still chewing on the color aspect of it (the source images may be color, or may be not). I'm confident re gray "colors" in a RGB colorspace - for instan...

Hello - I came across this topic in researching how to accomplish something I would like to try and accomplish. I've been working through the various posts, and ideas, but can't seem to figure out the best way to do what I need to do. If it would be better to create a new topic, then I will. Ultimat...