Lightroom and Photoshop colours

Roy Mathers wrote in post #3608291
Thanks canoflan - I shall try this, but it seems a bit annoying that you have to go to 'lights out' all the time to check the picture!

Additionally, I have learned on my printer how the print will turn out according to where most of the histogram lies. Usually, the histogram will not change significantly from LR to PS (in PS ensure you are looking at luminosity), therefore, after you see enough prints under the right light, you know by the layout of the histogram whether your pic will be bright enough in the print.

Pat

Rene - I found I had time to do this sooner than I expected. The Lightroom image is on the left, the Photoshop one on the right.

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canoflan wrote in post #3613651
Additionally, I have learned on my printer how the print will turn out according to where most of the histogram lies. Usually, the histogram will not change significantly from LR to PS (in PS ensure you are looking at luminosity), therefore, after you see enough prints under the right light, you know by the layout of the histogram whether your pic will be bright enough in the print.

Pat

That seems like a good tip.

Hi Roy,

Sounds now like a colour space issue. And re reading your quote

Roy Mathers wrote in post #3608268
Thanks for a very speedy reply! To explain a bit more - after I have exported, say, a tiff from LR to its own folder, I can open that tiff in PS and, if I compare it with the version of it in the Library module in LR, it looks darker.

Sort of points that way. Reading Adobe's FAQ's there is an article about library and Develop modules saying that

'The Library and Develop modules display images using different processes and color spaces.
Artifacts, like those sometimes seen in JPEG images, may appear in previews in the Library when the preview cache is written to repeatedly. The Library displays image data that began at full resolution and was downsampled for the display. If you view the previews in a view that is less than 1:1, noise can display because of the way previews are downsampled.
The Develop module downsamples photos before processing their color and tonal data. Because this method differs from the method used by the Library module to process photos, your photos might look different when you open them in the Develop module, especially if you view them in a size other than 1:1.
Zooming to 1:1 should remove most of the differences in your images between the two modules. It is possible, but less likely, that differences are due to differing color spaces. The Library previews are stored in the AdobeRGB color space to save file size, whereas the Develop module stores photos using the ProPhotoRGB color space, which has a larger gamut of colors'

Compare your saved output with the rendered copy in the Develop module.

What colour spaces are you using?

You may have a reason to work with tiffs pre PS but I think it is much easier a workflow to work with psd's open PS from lightroom from the raw, work in proPhoto RGB in CS2 (as in lightroom) and when you have done all your tweaking to convert to your preferred colour space for your output and save to a final tiff.