Bug in Digital Photo Professional 4

[son_of_man]

Picture turns purple at the left and right edge after a raw conversion.

The first image is converted from Adobe lightroom, and the second image is converted with latest DPP. Notice the slight purple coloring at the very right edge.

I only adjusted color temperature, de-noise options and lens corrections (vignetting).

Please let me know if there's any workarounds on this.

Thanks!

[son_of_man]

Further investigation shows this purple edge only comes up when I turn up "Reduce Chrominance Noise", this instance it has this option turned all the way to 20.

[shadowsports]

Greetings,

If this happens in LR and DPP, why do you think its a bug in DPP?  None of my RAW files turn purple if I slide Reduce Chromiance slider all the way down to 20.  Have no idea what color temp you used.  Do I need to convert to reproduce? 

We need some more details.

Suggest you post original image of "grassy knoll" and provide details about the shot, your system specs and OS.  All I see are some purple blobs on my screen with what looks like noise, blades of grass and some trees.

[son_of_man]

Hi there,

The purple edge does NOT happen in LR, which is why I suspect it's a DPP bug. 

Bug cannot be reproduced in jpeg images, must be RAW. I'm using a color temperature around 5300K.

I was using a 6D, firmware 1.1.3, and now processing with Windows 10, and DPP 4.7.2, image is shot @ iso 1600, 1/400s,  f7.3

There is a similar color toned image @ iso 200, 1/400s, f8, color temperature is around 5800K that showed the same effect, see below.

I have tried similar processing on my 5D Mark II, no such effect occurs. So you probably can't reproduce it on your camera.

The original picture won't matter here because this is the only spot that has this problem, left and right edges. purple on right edge is more pronounced. Aspect ratio is 3:2 landscape of course.

[son_of_man]

Same effect does occur with firmware 1.1.8 as well.

[Peter]

Upload a raw sample.
I get a purple line at the bottom with my 6D when shooting in Live view. I asked the makers of my raw converter to remove one pixel line. I wrote about it here once.

[son_of_man]

Thanks for that info.

I posted the raw file here, let me know if you guys can see it.

https://drive.google.com/open?id=1G3tFmDiLeeipFjO7CJVEaAt7NovJXVnr

[RobertTheFat]

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son_of_man wrote:

Thanks for that info.

I posted the raw file here, let me know if you guys can see it.

https://drive.google.com/open?id=1G3tFmDiLeeipFjO7CJVEaAt7NovJXVnr

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I opened it in DPP 4.7.20 and didn't see anything out of the ordinary. I did an auto gamma adjustment on it and still don't.

[son_of_man]

HI Bob,

Thanks for the info, did you try turning the chrominance noise to 20 though? It's in the "Adjust Image Details" tab.

Thanks again!

[RobertTheFat]

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@son_of_man wrote:

HI Bob,

Thanks for the info, did you try turning the chrominance noise to 20 though? It's in the "Adjust Image Details" tab.

Thanks again!

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OK, I turned the chrominance noise reduction up to 20. It made the picture a little less smooth overall and the waves a little more contrasty, but had no effect on the colors that I could see.