Histogram issue in DxO Photolab

Started 3 months ago | Discussions thread
Ernie Misner
Ernie Misner Veteran Member • Posts: 7,434
Re: Histogram issue in DxO Photolab
2

petrvv wrote:

I've been using DxO PhotoLab 4 (Windows 10) to process RAW files and export to jpg. Histogram shown in DxO is different from the JPG opened in Photoshop CS5.

Histogram in DxO (blacks are not clipped):

When I export the image to JPG and open it in PS, it shows the following histogram with blacks clipped (it shows Luminance as in DxO):

It doesn't look any darker in PS compared to DxO and even the color picker shows very similar RGB values both in DxO and PS. Both DxO and PS are set to sRGB.

I thought DxO worked in AdobeRGB, no? If so, and then it is getting converted to sRGB in PS that would explain the clipped blacks.

If I convert the RAW file in ACR, the histograms in ACR and PS look the same. ACDSee shows the same clipped histogram as PS. It seems the problem is somewhere in DxO.

What could be the reason?

Thanks for any suggestions.

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Ernie Misner
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The first digital image was made in the late '60's for NASA, as a way to record images of Mars. Each "square" was represented by three numbers, corresponding to the red, green, and blue hue on a scale of 0 to 255. This eliminated the need to ship film back to Earth.

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