Rendering of colors - how ?
Hello,
I just converted a bunch of images with Capture One 5 Pro. I found out that a purple color (of my daugther's clothes) was rendered blue (darkish blue). I found out that this has to do with the way Capture One deals with colors. It has 4 options:
- perceptual;
- relative colorimetric;
- saturation;
- absolute colorimetric.
For the 'wrong' rendering of the purple color I used perceptual. Switching to absolute colorimetric renders the correct color.
As far as I know it is not a white balance issue, cause the other colors are rendered correctly.
Can anyone inform me about those options and which option is the best to use or which option for what kind of picture is the best !
Remmelt
I just converted a bunch of images with Capture One 5 Pro. I found out that a purple color (of my daugther's clothes) was rendered blue (darkish blue). I found out that this has to do with the way Capture One deals with colors. It has 4 options:
- perceptual;
- relative colorimetric;
- saturation;
- absolute colorimetric.
For the 'wrong' rendering of the purple color I used perceptual. Switching to absolute colorimetric renders the correct color.
As far as I know it is not a white balance issue, cause the other colors are rendered correctly.
Can anyone inform me about those options and which option is the best to use or which option for what kind of picture is the best !
Remmelt
0
-
Hi
if you Google:
relative colorimetric saturation absolute colorimetric
You'll get a lot of links to get -sort of- answers…
This is one of them, even if it explains about converting color space from rgb to cmyk, it is the same concept than from one rgb space to another:
http://www.cambridgeincolour.com/tutori ... ersion.htm
You may need an aspirin! 😊0 -
The tutorial Nicolas refers to in his post is one of the best and easy to read sources on the Net I have seen so far. In addition to that information I like to pass on some information I got in a training with Walter Borchenko I visited recently. He gave the following rule of thumb for using the rendering intent (r.i.) setting in Capture One 5 Pro: Key is the r.i. tag in the destination or output profile in your output recipe (like AdobeRGB for example). You can open that profile with ColorSync utility when on Mac and view the tag. Next, you align the CO5 setting with this tag. Note that most popular RGB color spaces as well as camera profiles have the tag set to Perceptual.
You are free to use another r.i. to your liking. The tutorial referred to in this thread explains that as well. But on what device do you check the result? Your screen, which might have a (fairly small) sRGB sized color space, or your semi-pro inkjet printer (considerable larger than sRGB)?
You see, much to explore. 😉
Next aspirin please.0 -
Hello,
I check the colors on my Imac-screen. The color profile used for that screen is the default one and its rendering intent is perceptual.
In CO5 I have set a RGB-profile in the ouput-recipe. This profile also has a r.i. of perceptual.
So what's happening. Oh, BTW the in-camera processed JPEG is also displayed in CO5 and the JPEG shows the correct purple color of my daughters jacket.
Remmelt0 -
[quote="Remmelt1" wrote:
...
In CO5 I have set a RGB-profile in the ouput-recipe.
Which RGB profile?0 -
The exact name of this ICC profile is 'sRGB Color Space Profile' 0 -
Hmm, perhaps a camera profile issue. Do you have a Nikon DSLR? Did you update to the latest CO5 and applied the v2 camera profile (just to get the picture, if you understand what I mean). 0 -
[quote="Paul_E" wrote:
this is - unfortunatley - not true.
The tutorial Nicolas refers to in his post is one of the best and easy to read sources on the Net I have seen so far. In addition to that information I like to pass on some information I got in a training with Walter Borchenko I visited recently. He gave the following rule of thumb for using the rendering intent (r.i.) setting in Capture One 5 Pro:Key is the r.i. tag in the destination or output profile in your output recipe (like AdobeRGB for example). You can open that profile with ColorSync utility when on Mac and view the tag. Next, you align the CO5 setting with this tag. Note that most popular RGB color spaces as well as camera profiles have the tag set to Perceptual.
TRC matrix profiles do not contain the respective tables for perceptual translation. In other words: when the target profile is a matrix profile the only rendering intend available is relcol (either way what the prefs are set to):
http://www.colorwiki.com/wiki/Color_Man ... Eworkspace.0 -
Hi Paul and Thowi,
I am using the most recent version of CO5 and it's a Nikon D90 and I am using the v2 profile !
Thowi: I'll read into the link you provided.
Thanks,
Research continues
BTW In Lightroom or Capture NX2 this problem does not arise !
Remmelt0 -
Thanks Thowi for the link. Now I recall this from Bruce Fraser's Real World Color Management. 0 -
[quote="Paul_E" wrote:
BTW: the color prefs in C1 also apply to the transalation to the monitor profile. Of course again only for table based monitor profiles that contain a perceptual table - but I think for the translation to the monitor profile any other setting than rel.col simply doesn't make sense (too, I think even table based monitor profiles use the same values in the preceptual and rel.col tables ... so the outcome would be the same in this case. Am not quite sure, though).
Thanks Thowi for the link. Now I recall this from Bruce Fraser's Real World Color Management.
This is why I don't understand why Phase One's default is set to perceptual. It is useful for certain purposes (sofproofing with printer profiles or if you process to a table based working space like PhotogamutRGB or for instance to the so called "reference print medium gamut"-profile). Otherwise default should be rel.col.
The profile tag Walter B. referrs to is also totally irrelevant as long as you use a software that overwrites profile commands (like C1, Photoshop and many others do) ... well, and if you use matrix profiles the profile tag is irrelevant anyway.0 -
Hi,
Okay. There are loads of detailed papers to read and sites to visit. Is the problem I described unique ? I guess not, is it ? So please what can I do ?
Remmelt0 -
[quote="Remmelt1" wrote:
There are loads of detailed papers to read
Yes![quote="Remmelt1" wrote:
Is the problem I described unique ?
No![quote="Remmelt1" wrote:
So please what can I do ?
Read! 😉
And read again…0 -
[quote="thowi" wrote:
http://www.brucelindbloom.com/MunsellCalcHelp.html#BluePurple
Yep!
Very easy to understand… the "why", but not the "how" for simple end users like us! (or maybe my English ain't good enough:'(
Good read anyway…0 -
Hi,
As an end user I do not understand the article. But my problem is the other way around. In reality it is purple but Capture One 5 Pro makes it blue, using the version 2 ICC profile for my D90 (Nikon D90 Generic v2). I just found out that using the older ICC profile the problem dissapears and the color is purple !
So can it be an error in this new profile ??
Remmelt0 -
[quote="Remmelt1" wrote:
... I just found out that using the older ICC profile the problem dissapears and the color is purple !
So can it be an error in this new profile ??
It very much seems it is.0 -
[quote="Remmelt1" wrote:
what happens when you set the input profile to "no color correction" (or alternatively to "color view")?
I just found out that using the older ICC profile the problem dissapears and the color is purple !
So can it be an error in this new profile ??
Apart from the resulting desaturation.... is the V1 or the V2 profile basically closer to "no color correction"?0
Post is closed for comments.
Comments
18 comments