Renditions of Three Popular Colour Targets
These Lab renditions of Macbeth ColorChecker, ColorChecker DC, and ColorChecker SG (attached archive contains three 16-bit Lab TIFF files of the targets; if you need them larger please upsize in Photoshop using "Nearest Neighbor" method in Image -> Image Size) can serve as a visual reference as well as for adjustments "by numbers" during raw conversion and post-processing.
Please note that ColorChecker SG contains a structure very similar in appearance to 24-patch regular ColorChecker; but the values of patches are in fact different.
| Attachment | Size |
|---|---|
| ColorCheckerTargets.zip | 13.67 KB |
Comments
Were these produced from spectral data, from measured or published LAB values, or from RGB data in a known colorspace and whitepoint? What is the illuminant used?
These were produced from spectral data.
Okay, good. That will produce the best results. What illuminant was used - D65? D50?
It was D50, 3 of CC24 averaged (last batch), 2 SG and 2 DC. Device used was Gretag Spectrolino.
Thanks once again!
thanks for these files
i am using an e1io(uv)and have a delta E of about 3 to the GM spectrolino data
is the program you used to convert the GB measured text lab values to an image available? you would be welcome to my i1 results
thanks
david morrell
by email and comment
To convert, you can use free ColorLab utility
http://www.xrite.com/product_overview.aspx?ID=1071&Action=support&Softwa...
You should be able to convert spectral measurement data using the program above.
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