Red and Blue

by Gordon

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0

If you have a image that you think requires colour balancing and has no obvious reference point to select, ie no white, black or grey, the you can temporarily covert the image to black and white and look or or use the White balance picker to select a netral grey area. Remember that spot and recovery to colour and select it with the picker. Grass, road ...


2

Ouch... You have a nightmare scenario. I'm making some initial questions just as an excercise of posible scenarios. 1) You know the color of the samples... but Are the ilumination angles the same? 2) Is the response curve diferent between shoots? 3) Do a linear editing of the curves enought? or should I modify the gamma of each channel? How about the ...


0

Is there a tool (preferably to use with Photoshop) that can do such color calibration? Try looking at iCorrect EditLab Pro http://www.pictocolor.com/editlabpro.htm It has a feature to do exactly that. Here is how to add a "Memory Color" - I'm picking one of the colours from ColorChecker reference rendition to sRGB, the "purple", and after ...


2

You can do this manually if you know what the color is supposed to be. It is similar to the process of calibrating to a neutral sample. The results will not be as accurate as if you use a grayscale, especially with mixed color lighting. You should work from a RAW file if available. First, set a best guess white balance. Measure the known color in your ...


0

LCD monitors are "linear", and do not need gamma today, but CRT monitors are nonlinear, and still do. And all the worlds archives of existing images do have gamma for CRT, so it's much easier to continue adding gamma than to change all software, and obsolete all existing images. The human eye absolutely has no use for gamma. The eye sees the original ...


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Apparently Windows doesn't manage ICC profiles created with version 4, so I'd have to use version 2 while calibrating. Source: X-Rite support How not to make Windows display false colors


4

There are actually three possibilities here. First and most likely, I think, make sure you have the latest colorhug firmware. Run colorhug-flash to check. I have one of the very first colorhugs, and this red cast was common, but sometime in the last year a new firmware reduced this significantly. Second, there's actually the possibility that it's not as ...


2

Here are some of the ways: http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspec http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspecs-express I use a monochromator, light sphere, and a photodiode. You can find most of those supplies at Edmund Optics http://www.edmundoptics.com/ and similar shops. You ...


1

Yes, color sensitivity is often measured and specified in bits. DxOMark provides one example and incorporates this into their camera ratings. From the description of their "Color Depth" test: Color sensitivity indicates to what degree of subtlety color nuances can be distinguished from one another, often meaning a hit or a miss on a Pantone ...


0

To answer my own question: As it turns out, the effect I was seeing was created by some weird color management behaviour in darktable. Even though darktable-cmstest reported for both screens that "the X atom and colord returned the same profile", the weird behaviour went away with a configuration setting: I've now set the GUI option how darktable locates the ...


1

The OP is pretty much all correct, except that gamma makes the dark tones brighter, not dimmer. This exists just in the file, not in the eye. The data is always decoded back to original linear BEFORE any eye sees it. Any difference in the eye seeing the original scene, and seeing the reproduced decoded data, is simply an undesired reproduction error. ...


1

Photoshop and Lightroom are color-managed software tools while the windows preview isn't. If you're doing softproof with any type of profile, it's normal that it appears strange. Softproofing is only to see how the prints will come out. Check out the eBook to get knowledge about the whole workflow of digital color management: ...



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