Colour difference with layers

[WulfstanDesign]

Hi.

I've used the Snip It tool to grab a screen image and because it was large I've done it in 4 parts and save as jpgs.

When I then bring them into Photoshop as layers to create one big image I've noticed there is a change in the colour/tone. They don't match, which is very noticable on overlaps. I've tried embedding/seeting to a sRGB profile in the master document and in the original files, but no go.

Any ideas on what I can do or what is causing this?

[D Fosse]

First of all, make sure the file already has an embedded color profile. If it doesn't, all bets are off.

A screenshot is a special case. The numbers in the screenshot have already been converted by the color management system, from the original document profile into your monitor profile. The original profile no longer applies. Those recalculated numbers are sent to screen (thus representing the file correctly in the new color space).

So what you do is first to assign your monitor profile. Then you convert back to the original document profile.

They will now match perfectly.

[Stephen Marsh]

All the screenshots should have been captured with consistent colour.

So was it the processing into Photoshop that was inconsistent, such as selecting different source profiles or conversions etc?

[WulfstanDesign]

Yeah. Basically 4 jpgs. I opened the first, converted the background to a lyer, extended the canvas, then dragged the other 3 jpgs in to it. When lining up the layers I could see the tonal difference.

[NB, colourmanagement]

@WulfstanDesign IF you capture the 4 screenshots in exactly the same way and process correctly then they should match (be sure Snip-it isn't doing any colour processing or correction.)

Next, upon opening Photoshop you assign your display's ICC profile to each, then convert to a workingspace, sRGB is likely an OK choice in this scenario.

I'd open the 4 images individually in Photoshop first (processing the colour as above) then make a new doc to fit all 4 and drag them into 4 layers, set the overlaps and flatten - but check they match before dragging. 

Let us know how it goes.

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management
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[WulfstanDesign]

Thank you. Just seen the update. I will give it a try and let you know.

[D Fosse]

Which is exactly what I said in the first post.

Assign your monitor profile > convert to the original document profile. You have to do this if you want it to match the original document.

[jane-e]

I've used the Snip It tool to grab a screen image and because it was large I've done it in 4 parts and save as jpgs.

By @WulfstanDesign

Windows Snipping Tool can capture your full screen as one screenshot. What happens when you try that?

Details here: 
https://support.microsoft.com/en-us/windows/use-snipping-tool-to-capture-screenshots-00246869-1843-6...

Jane