Balance analog sensor for 2850K color table

Hello

Currently, I'm trying to create a camera profile double bulb using DNG Profile Editor 1.0.0.46 beta for our camera Aptina CMOS MT9P031 base.

Using the DNG SDK 1.4 format, I am to convert images of model BAYER to a DNG with an embedded profile that has the identity on the analogue scale DNG tags and color matrices matrices.

D65 shooting conditions:

-LED high-IRC based game of 6500K light source @ 300 lx (spectrum fit 96%)

-Analog CMOS sensor gains have been adapted to achieve a neutral image to the D65 shooting conditions

a. do I have to keep all the winnings of component to 1.0 or adjust lighting?

b. whatever I apply on the tag AnalogBalance DNG camera profile?

STD A shooting conditions:

-Even turn on the value source 2850K @ 300 lx (spectrum fit 92%)

-CMOS sensor analog gains were _not_ suitable to achieve a neutral image. This obviously translates a shade of orange that can be eliminated by using the slider on the tab "Color matrix" white balance of the DNG profile editor.

c. I have to adjust analog gains when shooting for 2850 K

Using the converted DNG shooting of the above conditions, I can create the table of colors for 6500K by using the 'Table' tab, but not the color of 2850 K. I always get the error message:

"Gray patches not neutral. The grey patch on line 4, column 3, an important nuance. Please remove the graph carefully to avoid color casts, and then try again. »

.. .but when you use the cursor whitebalanace on the tab "color Matrices" before the 'Table' tab, I can fix the Std picture has a perfect neutral image. No color cast visible, there is more.

d. all the ideas that I was wrong?

Kind regards

Blad

Hi Daniel,.

a. sorry, I do not understand this question.  Can clarify you?

b. the label of AnalogBalance can be practical, to make connections between the conditions of gain of capture and the temperature/tint (white point) that is displayed to the user in the raw (such as the ACR/Lr) conversion software.  You can omit it, the reported temperature/tint values will be probably crazy/incorrect.

c. the issue is most likely the fact that we have a range of temperature internal/tint which is limited (e.g., 2000-50K temperature,-150 to + 150 for hue).  Normally this isn't a problem when generating profiles of colors, since the calibration data illuminating are well within these limits (for example, ~ 6504 K temp to D65, ~ 2856 K for Standard Illuminant A).  However, when the AnalogBalance and/or ColorMatrix values are missing or set to identity, then it will not be a correct translation between gains (aka, AsShotNeutral value) and the white calibration point.  This will prevent white-balancing step to work correctly (*) and explains why you spin the question.

Ideally you should show the ColorMatrix tag for the case incandescent to the matrix which maps the point 'A' white to the values of the system/sensor under the light of calibration "as neutral" (the "also shot neutral" is actually in contrast to gains).

d. see (c) above.

(*)  A click of the white step in essentially, sampling linear 'rough' or 'entered' the click point values.  These values are then mapped across the AnalogBalance and ColorMatrix tags to determine the point white (temp/tint values), by Chapter 6 of the DNG specification.  If the values are outside the range supported temp/tint, they are then cut to the supported range.  (Possibly clipped) white point is translated through the tags analog/ColorMatrix Balance to determine gains / scaling factors used to neutralized or balance the area under the click point.

Tags: Adobe Camera Raw

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