Legacy ImageMagick Discussions Archive

No, I'm not thinking of blend; it's just a 'tracing-paper' method really.

Hi, Fred? You're right about the 128x128; that was for the full size images. I also see what you mean about the overlay compositing method but I can't see a way to do without needing shifts in levels, which I was trying to avoid because of the possibility of clipping - I might've misunderstood the n...

That's true for a grey-card that's intended for exposure control. The theory says that an average scene is 18% grey (tonally). In truth only Ansel Adams wanted 18% - for his own reasons. In the real world an average scene is about 13% grey and all digital cameras conform to that percentage for meter...

Hello again. I've solved the problem. It goes like this... convert MAIN.JPG ^ ( +clone ( REFERENCE.JPG -gravity Center -crop "128x128+0+0" -scale "1x1" -negate ) +dither -interpolate Integer -clut ) ^ -compose Overlay -composite ^ FIXED.JPG The white reference target will be disc...

Hi to you. I should have explained myself better. It's standard practice with some photographers to take a shot of a reference grey-card at the beginning of a sequence of images. This reference shot becomes the guide to the colour cast in all the images until the light is different and requires a ne...

Hi. Thanks for the forum. There is a well-known way of correcting the white balance of any photograph using a second photograph, with neutral grey target in shot, taken under the same lighting conditions. The question is simply how to do this using IM. I thought of doing this by averaging the colour...