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Question

Incorrect conversion using ADOBE ACE

Forum|Forum|4 years ago
April 16, 2021
5 replies
1190 views

This issue has been plaguing ADOBE for years - it keeps popping up and causes us a lot of issues.

We need to output images with RGB background shade e1d3c4. Our projects have thousands of images (ecommerce) so we have to use software like Lightroom. The problem is, lightroom use ACE to convert the TIFF or PSD or other sources files, to JPG SRB 8 Bit files.

When this happens, the colour is changed to e1d4c4, not e1d3c4.

In PS, we can use the Apple CMM engine - if we do this, then it exports the JPG with the correct e1d4c4 shade no problem at all. This is an adobe ACE engine problem specifically and causes us so many headaches when a client wants a background colour to match their website colour.

I have attached two JPG images, one exported with ADOBE ACE one exported with APPLE CMM - the APPLE CMM conversion is bang on. The adobe conversion is always wrong.

It is not just an issue on MAC either - I had issues like this on windows for years - I had to do multiple colour profile conversions to get that to work, but nothing apart from using CMM works for Mac that I can tell. Anyone. have any other solutions?

I do not want to have to export via PS - it is too clunky and time consuming for the multiple thousands of images we produce monthly.

Our next step is to use Capture One as a catalogue to manage our files instead of Lightroom to see if we get better results with exporting (we have until now only used capture one sessions for tethering as we love the overlay - hate the AF spot movement though with Canon, does not work)).

This topic has been closed for replies.

Per Berntsen

Community Expert

Hex numbers are meaningless without the context of a color profile.

The two images below in sRGB and Adobe RGB both use the color #e1d3c4, which is the same as RGB 225-211-196.

I imported the sRGB tif file in Lightroom, then exported an sRGB jpg at 100 quality, which I opened in Photoshop.

The color had changed to RGB 225-212-196, or #e1d4c4.

The change in color is caused by the lossy jpg compression. If you need accurate colors, export PNG files from Lightroom instead. The PNG format uses lossless compression, and colors should not change. I exported a PNG from the tif, and the color did not change.

davescm

Community Expert

Those two images that you attached are identical. I downloaded both and put them on separate layers one above the other and set the upper to Difference blending mode. Result 0,0,0 across the document. Also both were in the Adobe RGB1998 color space. What are you trying to show?

Dave

c.pfaffenbichler

Community Expert

»When this happens, the colour is changed to e1d4c4, not e1d3c4.«

Changed from what?

And why are you using hexadecimal numbers anyway instead of plain RGB values?

c.pfaffenbichler

Community Expert

What are the source Color Space, the Intent, …?

Stephen Marsh

Community Expert

Should this have been posted to a Lr forum rather than Ps?

P

packshotbureauAuthor

Participating Frequently

Hi Stephen,

The proiblem is with both lightroom and PS, though happy tio post in Lightroom forum.

Stephen Marsh

Community Expert

Well you wrote

@packshotbureau wrote:
I do not want to have to export via PS - it is too clunky and time consuming for the multiple thousands of images we produce monthly.

Therefore, thought that it would be pointless looking for non Lr solutions.

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