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You are here: Home / The Last Word / a7RII/Lr ASP, C1 generic auto 6000K color accuracy

a7RII/Lr ASP, C1 generic auto 6000K color accuracy

December 21, 2015 JimK 2 Comments

This is the thirteenth in a series of posts on color reproduction. The series starts here.

In the title, a7RII stands for the Sony alpha 7R Mark II. Lr stands for Lightroom.  C1 stands for Capture 1. ASP stands for Adobe Standard Profile. Alpha Photo, a DPR contributor,  performed the Capture one conversion for me, using generic auto profile, and otherwise default settings. I am grateful for the help.

For more information on where I got the numbers that we’ll be looking at here, see this. Both Alpha Photo and I exported the images in the Adobe RGB color space.

The target vs actual numbers, in CIELab, first for ASP:

asp act vs target

And for Capture One:

C1 act tgt

And now the Delta E and Delta ab (chromaticity) errors. First for ASP:

asp deltas

And for C1:

c1 delta

The differences are not striking, are they?

Next, the nonlinearity of the luminance of the gray squares, first for ASP:

asp nl

And for C1:

c1 tone curve

The nonlinearities  are essentially the same. That’s a surprise to me.

Now, let’s look at changes in chroma (or colorfulness, or, if you will, saturation, although strictly speaking CIELab has no way to measure saturation). First for ASP:

asp chromaticity nums

And for C1:

C1 chroma error

You can see that the ASP profile increases chroma slightly over what a perfect color mapping would do, and C1 increases chroma a bit more.

Now let’s look at chromaticity plots for the two profiles, showing both the target and the measured chromaticities. First, ASP:

asp chrome plot

And now C1:

C1 ab plot

There are differences in the color mapping, but they are fairly minor. There are some systematic similarities. The intense reds are hyped a bit. The two blues that can go purple if you’re not careful are moved away from magenta. Skin tones are made ruddier.

Thanks again, Alpha Photo.

The Last Word

← a7RII/Lr ASP, Camera Neutral 6000K color accuracy Gamut and gamma →

Comments

  1. CarVac says

    December 22, 2015 at 10:55 pm

    How does the output of the converters you plot there correspond to the raw files’ raw values?

    Are the raws nonlinear in the same way (I doubt it, or else there’d be some seriously funky stuff going on when WB corrections are in effect)? Aside from the tone curve built into the lossy compressed files.

    Reply
    • Jim says

      December 23, 2015 at 9:48 am

      Are the raws nonlinear in the same way?

      No, the raws are remarkably linear if the black point is dealt with properly. None of the captured Macbeth sample values are anywhere near the black point of the raw files.

      That’s after decompression. The Sony cRAW files are nonlinear in their compressed form.

      Jim

      Reply

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