White Balance Setting Problem

Question

APPLE COMPUTER:
THREE BASIC QUESTIONS THAT NEED TO BE ANSWERED.
1. HOW DOES THE WHITE BALANCE TOOL WORK IN APERTURE?
2. HOW DO YOUR SOFTWARE ENGINEERS AND "PHOTOGRAPHIC CONSULTANTS" USE IT TO SET WHITE BALANCE?
3. WHAT ARE THE SIMILARITIES AND/OR DIFFERENCES IN ITS USE AS COMPARED TO SIMILAR TOOLS IN CAPTURE ONE PRO AND ADOBE PHOTOSHOP?

Answer 1

Test Results:
Aperture 1.1:
Image Temperature: 3594
Tint: -17
When using the white balance tool on a white section of a photo, the RGB values changed from R 255 G 234 B 192 to R 255 G 230 B 197 and the Temperature changed to 3946 and Tint to 12.
The photo still remained unacceptable.
When usint the white balance tool on a grey section of the same photo, the RGB values cahnge from R 211 G 178 B 126 to R 208 G 180 B 162 and the Temperatue changed to 3154 and Tint to 2.
The photo still remained unacceptable but was notably improved.
Using Capture One Pro, the results were as follows:
Temperatue: 3850
Tint: -10
When using the white balance tool on a white section of the same photo, the RGB values changed from R 255 G 241 B 200 to R 244 G 244 B 244 and the Temperature changed to 2500 and Tint to -16.
Photo was very acceptable with no perceivable colour cast.
When using the white balance tool on a grey section of the same photo, the RGB values changed from R 190 G 153 B 108 to R 153 G 153 B 153 and Temperature to 2550 and Tint to -2.
Photo was very acceptable with no perceivable colour cast.
From this quick test on a photo, I can draw the following conclusions:
1. Aperture interprets temperature and tint data differently from Capture One Pro, although this likely due to the use of a camera profile within Capture One Pro;
2. Using the white balance tool in Aperture on a "white" section does not neutralize the RGB values;
3. Using the white balance tool in Aperture on a "white" section does not correctly remove a colour cast within a photograph;
4. Using the white balance tool in Aperture on a "grey" section does not neutralize the RGB values; and
5. Using the white balance tool in Aperture on a "grey" section does not correctly remove a colour cast within a photograph, although it does work better.