ISSUES WITH RGB to LAB . . .
I am working with a customer that needs to convert from the RGB COLOR SPACE to the LAB COLOR SPACE.
There are two tools within IP10 that I am looking at to assist.
One is are the REGION MEASUREMENTS of LAB COLOR L, LAB COLOR a, and LAB COLOR b.
MEASURE RIBBON +
COLOR SECTION +
COLOR MANAGEMENT +
When I use a TEST IMAGE like the one shown here
where the CIRCLES are PURE RED, PURE GREEN, and PURE BLUE (PURE being 255) I get different values for L, a, and b when I use the REGION MEASUREMENTS and when I extract images for L, a, and b shown here.
The REGION MEASUREMENTS numbers are pretty close to the Lab numbers generated by two websites that I found but the extracted images are way different. Here are the REGIONS.
This is shown in the EXCEL SPREADSHEET shown below.
The REGION MEASUREMENTS are pretty close to the WEBSITE CONVERSIONS from the RGB VALUES but the IMAGES extracted using the TOOL are much different.
The IP10 HELP FILE regarding the EXTRACT for the L, a, and b does not suggest a reason for this difference.
Will someone here explain this difference please?
A copy of my TEST IMAGE with the IP10 REGIONS stored in it is attached in the ZIP FILE.