Colour Profiles - lightroom to photoshop to internet

[Overread13 1]

Ok so lightroom works in ProPhoto RGB.
When I then open the Photo into Photoshop its still in ProPhoto RGB. However if I then go and assign it an sRGB profile for upload to the net I get a huge colour change.


In the past I've never had to deal with this issue, colour profiles were just a profile the colours remained the same for me editing. Now suddenly am I doing something daft because I can't have my photos changing colours so drastically when shifting from lightroom to the net/

 

[tirediron]

Are you seeing the colour change in your browser, or in LR/PS?

 

[Vtec44]

I shoot RAW in AdobeRGB but export to JPEGs in sRGB. So, I haven't seen any changes to the colors of my files recently.

 

[The_Traveler]

Do not assign, always convert

 

[Overread13 1]

Are you seeing the colour change in your browser, or in LR/PS?

Seeing it in Photoshop itself

Do not assign, always convert

This might well be the answer - just tried it and yes didn't get the colour change! Thanks

 

[The_Traveler]

Assign means just pasting the new label on and leaving the color values the same - but the color values mean different things in ProPhoto and sRGB.
Convert actually has a lookup table to change all the color values and squeeze everything in the new (smaller) color space.

 

[Overread13 1]

Yeah that makes sense and does indeed explain why it didn't work the first way I tried it.

 

[fotomonkey]

I shoot RAW in AdobeRGB but export to JPEGs in sRGB. So, I haven't seen any changes to the colors of my files recently.

This is exactly how I operate.

What colors are changing? With ProPhoto don't blues and greens tend to get clipped?

 

[Ysarex83 77]

I shoot RAW in AdobeRGB but export to JPEGs in sRGB. So, I haven't seen any changes to the colors of my files recently.

This is exactly how I operate.

What colors are changing? With ProPhoto don't blues and greens tend to get clipped?

You can't shoot in RAW in AdobeRGB. Raw files do not have and can not have a color space -- they are not RGB photos.

Joe

Edit: Blues and greens do not get clipped in ProPhoto. ProPhoto is the largest of the three common color spaces: ProPhoto, AdobeRGB and sRGB.

 

[fotomonkey]

Well, yes, a raw file doesn't have a color space but PS is set to a specific color space that you're working with. LR uses Adobe and I'm not sure you can change it (I believe you can load printer profiles, though).

You sure about the blues and greens? I realize the gamut sizes, and if you go from a larger gamut to a smaller than something is going to be lost. Right? Here's a snip from Luminous Landscape:

...ProPhoto RGB encompass a great deal more of the visible spectrum, it actually exceeds it in the deep greens and deep blues. What this means is that colours can be pushed into areas which can neither be seen nor reproduced, producing very nasty looking results within the visible spectrum. User beware.

 

[Ysarex83 77]

Well, yes, a raw file doesn't have a color space but PS is set to a specific color space that you're working with. LR uses Adobe and I'm not sure you can change it (I believe you can load printer profiles, though).

You sure about the blues and greens? I realize the gamut sizes, and if you go from a larger gamut to a smaller than something is going to be lost. Right? Here's a snip from Luminous Landscape:

...ProPhoto RGB encompass a great deal more of the visible spectrum, it actually exceeds it in the deep greens and deep blues. What this means is that colours can be pushed into areas which can neither be seen nor reproduced, producing very nasty looking results within the visible spectrum. User beware.

LR does not use AdobeRGB. LR uses a very close variant of ProPhoto RGB and that choice is not adjustable/selectable by the photographer. Photoshop can be set to any working color space but will accept a photo in a different space than the working space and either adapt or convert the photo.

ProPhoto is the larger of the three common color spaces. It encompasses the other two and so it would contain more blues and greens than the other two. If you demosaic a raw file in LR it will be assigned the ProPhoto color space whether you like it or not. You can then export the photo to another application (eg. Photoshop) and either assign a different color space during export or convert the color space in the receiving application.

Joe

 

[fotomonkey]

Joe, I think you're missing what I'm saying about the blues and greens. If you have a larger color space (eg ProPhoto) and go to a smaller one (eg sRGB) then you can clip colors because they don't exist in the new color space.

As far as LR goes, this is from Lightroom Help | Color management

Lightroom primarily uses the Adobe RGB color space to display colors. The Adobe RGB gamut includes most of the colors that digital cameras can capture as well as some printable colors (cyans and blues, in particular) that can’t be defined using the smaller, web-friendly sRGB color space.

In the Develop module, by default Lightroom displays previews using the ProPhoto RGB color space.

So perhaps we're both right.

This is all I'm going to say. I'm done. No need to start an internet pissing match.

 

[Ysarex83 77]

Joe, I think you're missing what I'm saying about the blues and greens. If you have a larger color space (eg ProPhoto) and go to a smaller one (eg sRGB) then you can clip colors because they don't exist in the new color space.

You could but that would be a bad idea. You'd be much better off to use software like LR and Photoshop which will convert between those color spaces. Conversion is a whole different concept and process than clipping.

As far as LR goes, this is from Lightroom Help | Color management

Lightroom primarily uses the Adobe RGB color space to display colors. The Adobe RGB gamut includes most of the colors that digital cameras can capture as well as some printable colors (cyans and blues, in particular) that can’t be defined using the smaller, web-friendly sRGB color space.

In the Develop module, by default Lightroom displays previews using the ProPhoto RGB color space.

LR's image previews are rendered in the Adobe RGB space. That's what that quote above is referring to. When you open a Photo in LR to edit or in anyway work on that photo it's in the ProPhoto color space (actually a minor variant unique to LR called Melissa). When you export the photo from LR it will be and can only be in the ProPhoto color space at that time. No other option is possible. You can at that time chose to convert it or not.

So perhaps we're both right.

This is all I'm going to say. I'm done. No need to start an internet pissing match.

I'm not pissing anywhere -- just getting the facts straight.

Joe

 

[KmH]

The only significant difference between LR's Melissa RGB and ProPhoto RGB is the gamma value.