There is a color difference between the downloaded image and the one on Google Art.

[ngoncom]

Hi,

Recently, I noticed a color difference between the image on Google Art and the downloaded image, let see:

• Image on Google Art:

(link: https://artsandculture.google.com/asset/etude-pour-vers-le-bleu/1gH8RLY-nW279Q)

• Downloaded image:
  

Thank you!

[lovasoa]

Zoom in on the Google art version. At max zoom, it should have the same color as what you downloaded.

dezoomify-rs also lets you download the smaller versions (that have different colors) if you need.

[ngoncom]

dezoomify-rs also lets you download the smaller versions (that have different colors) if you need.

I tried downloading from zoom level 1 to 4 but the pictures have different colors than on Google, can you help me review it?

Oh, It seems that different versions of Dezoomify will produce images with different colors.

I have tried the last 4 versions:

• v2.12.4
• v2.12.3 (same v2.12.4)
• v2.12.2 (error while downloading)
• v2.12.1

The downloaded images between versions v2.12.4 and v2.12.1 are actually a little different. The image of v2.12.1 has 'more pink color' than v2.12.4

Image from v2.12.4

Image from v2.12.1

But these versions are still different from the image on the Google website.

Thanks!

[IGUPAYITI]

I found a color difference too while using dezoomify-rs but no with dezoomify web.
I have opened an issue there, with images for reference:
#259

[DigitalCurator]

Use hue-tint normalisation/correction.

[ngoncom]

I found a color difference too while using dezoomify-rs but no with dezoomify web. I have opened an issue there, with images for reference: https://github.com/lovasoa/dezoomify-rs/issues/259

Yes, I confirm that the web version is correct as on Google, but the Dezoomify-rs is not. Please see this:

Use hue-tint normalisation/correction.

Can you help me how to do it, thank you?

[lovasoa]

Should be fixed in 2.13

[ngoncom]

Should be fixed in 2.13

I just tried v2.13 version but didn't see any difference, please help!

[lovasoa]

Can you post an url, and the two files you get, with the old working version and with the new one?

[ngoncom]

Can you post an url, and the two files you get, with the old working version and with the new one?

Thanks for your reply, here are the images downloaded from 2 different versions: v2.12.1 and v2.13.0

v2.12.1

v2.13.0

Image link: https://artsandculture.google.com/asset/etude-pour-vers-le-bleu/1gH8RLY-nW279Q

As you can see, the image from v2.13.0 is bigger than v2.12.1, but both versions have different colors than the image on Google Art website.

[IGUPAYITI]

Hello, I'm the user who opened the issue about the "Green Distortion" of the latest dezoomify-rs versions.
For me the latest version fixed it! Because I'm still in the midst of my art printing project for caution I again ran a test using the Getty website that also offers direct download. The two images were almost identical analyzed with Adobe Photoshop color histogram with the difference absolutely non noticeable to me:

Direct Download Color Histogram
Mean: 38.77
Standard Deviation: 39.66

Dezoomify-rs Color Histogram
Mean: 38.69
Standard Deviation: 39.77

I'm really no tech expert so maybe @lovasoa could run a better test... @ngoncom I can only advise you to try download in a lossless format like TIFF using -rs from the command prompt which is the method I've used.
I'm available for help, have a nice day.

[ngoncom]

@IGUPAYITI : Actually I don't know how to download images like on Google website.

I see dezoomify.ophir.dev has done that very well, but dont know how to do it when using dezoomify-rs.

This is the image downloaded on dezoomify.ophir.dev, it's awesome:

And here is how I use dezoomify-rs to download:

[IGUPAYITI]

Greetings @ngoncom, for running dezoomify through the Command Prompt drag dezoomify-rs.exe into the Command Prompt then type image URL and desired filename with quotation marks.
E.g.
C:\Users\ngoncom>C:\Users\ngoncom\Downloads\dezoomify-rs.exe "https://artsandculture.google.com/asset/etude-pour-vers-le-bleu/1gH8RLY-nW279Q" "Wassily Kandinsky, Study for To The Blue, 1939.tif"
Trying to change the output to a lossless format like .tif may solve the problem.
Also if you have an hard time finding image URLs other than Arts&Culture you can use the dezoomify browser extension which most of the times detects it automatically. For Chrome:
https://chromewebstore.google.com/detail/dezoomify/iapjjopjejpelnfdonefbffahmcndfbm
Hope it works, goodbye.

[ngoncom]

@IGUPAYITI:

I apologize for wasting your time, but I'm really not satisfied.

If you download it as .tif, the image size increases terribly (123 Mb for .tif, but only 2.77 Mb for .jpg). Meanwhile, the problem I care about is the color, it is still not solved (the color is not as beautiful as on Google).

[IGUPAYITI]

Dezoomify-rs it is not the problem, it is your image viewer program misinterpreting the data because of a missing color profile. Dezoomify-rs can't download attached color profile. Most of the times it is simply sRGB and your program display it correctly by default but sometimes it is a wider RGB (Adobe, ProPhoto etc.) and you need to try assigning different profiles yourself to find the one matching the online image. If not the image will appear highly desaturated.
In this case you should assign ProPhoto RGB.
You should have tried downloading other images to see if the problem was specific with your desired file because nine times out of ten the default online color profile is sRGB and there shouldn't have been any problem.

[lovasoa]

Well dezoomify-rs is part of the problem, because it does not write the color profile from the individual tiles into the final image...