Legacy ImageMagick Discussions Archive

Nope. Wrong again. Back where I started. Any information would be appreciated but I won't hold my breath. Thanks.

s.

I'm not 100% sure, but I have been playing with these hald cluts for a while now, so I feel your pain about file size! :)

I do have a theory about the identity hald clut file ...

After looking at a newer version of IM, it appears that -poly may be what I'm looking for?

So if I have a frame 4, that is the mean average of all frames up to (and including 4), I can then add frame 5 to the cumulative average through the coefficient weighting in -poly? (ie: upto4.png 5.png -poly ...

Hi all!

I've been doing some mean averaging of different stuff for a while now using IM, and I had a question I hoped some guru could help me solve.

I have a few music videos that I've dumped all of the frames for, then batch mean averaged all of the frames to produce a final mean average output ...

snibgo wrote:Here we go. With luck, I won't lose this one. A Windows script (that I call whatMod.bat).

I wanted to drop in and thank you very much for taking the time to do this!

The script crashes my IM for some reason, but I've gotten exactly what I need to do it manually out of your script, so thank you.

Yes, it is one way, and I found it successful. (I wish I could find my code!!)

From very vague memory:

1. Find the HSL difference between images A and B. This gives approximate parameters for "-modulate", to transform A to B.

This is the black magic part for me. Is there a method for ...

I've tried to solve a similar question: given corresponding colour patches in two images, what transformation from one makes the other?

Sorry, I can't find my code. From memory, I needed to iterate to get the "-modulate" parameters, even when the only initial transformation was "-modulate". But it ...

So, if I had an image that I know to be some pure red color ( rgb(255,0,0) ), and a second image identical in all ways, except there has been an HSL shift of some sort, there's not a way for me to determine what that shift was? (Sorry if I'm dense, just trying to understand a path forward).

Hi all,

I'll get right to it...

I've got a base image that I apply some color modifications to (namely, HSL shifts, and then RGB curve shifts).

I'd like to find a way to extract the shift values between the base/identity image, and the color modified version.

For instance, I've got a HALD CLUT ...