working spaces

Express and discuss your wish for a new feature in SilverFast

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Stefan
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Postby Stefan » Sat Sep 01, 2001 1:52 pm

When choosing different working spaces in SF,as far as I found out,two different things happen.
The colors get more or less saturated depending on the size of the choosen color space.And also the color values change.What I would like to see would be a possibility to choose between two options,which you have in Photoshop 6."Assign profile",which doesn`t change the color values,but the colors themselves.And,as an option,
?convert to profile",what only changes the color values,but NOT the colors( as long as they fit into the desired space).

ilyons
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Postby ilyons » Sat Sep 01, 2001 4:32 pm

Stefen,


On 2001-09-01 14:52, Stefan wrote:
When choosing different working spaces in SF,as far as I found out,two different things happen.
The colors get more or less saturated depending on the size of the choosen color space.And also the color values change.What I would like to see would be a possibility to choose between two options,which you have in Photoshop 6."Assign profile",which doesn`t change the color values,but the colors themselves.And,as an option,
?convert to profile",what only changes the color values,but NOT the colors( as long as they fit into the desired space).




I answered your earlier message, but reading this one I can't help but feel you don't fully understand what Assign Profile and Convert to Profile do.

Assign Profile simply gives a meaning to the RGB numbers. If you define those numbers wrongly the image appearance will be wrong. The ONLY profile you want to "assign" to an image is the correct profile or in the absence of the correct device profile a working space profile that closely matches the gamut of the device but it will VERY rarely handle the non-lineatity of that device, so neutrals may not appear neutral.

Convert to profile has a different purpose. The aim of convert to profile is to take an image from one colour space to another in a manner that retains the original images appearance so far as is practicable. This is sometimes NOT possible since the source or destination may NOT be well behaved (not linear). A scanner, digicam and to a larger extent a printer are perfect examples of devices that are poorly behaved and so appearance is rarely retained. This is what we are after with the scanenr and digicam profiles, but the printer profile usually makes our image appear less than ideal. Working spaces are designed to be well behaved and so appearance can usually be retained.

When SilverFast is configured to use the calibration module or ICC/ColorSync it bases the preview on an appropriate "assign and convert" function that broadly replicates the Profile to Profile feature of PS5 (the exact methodolgy might be different but the result is the same). So long as our monitor is accurately calibrated and Internal Monitor is set for Automatic along with Internal to the same working space as Photoshop all will be well and we can edit our images knowing that the result will be the as we require when it arrives in Photoshop - no matter whether it is PS5 or PS6. If we chose a different working space in SilverFast then PS5 users will NEED to allow conversion from this space to their actual working space when the image opens in Photoshop 5 otherwise the image appearance will be wrong. PS6 users can simply allow the image to open in the same colour space as they chose in SilverFast and the image appearance will be retained

The approach adopted by LaserSoft and outlined above is universally accepted, is simple and works WELL



Ian




<font size=-1>[ This Message was edited by: ilyons on 2001-09-01 17:49 ]</font>

<font size=-1>[ This Message was edited by: ilyons on 2001-09-01 19:03 ]</font>

Stefan
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Postby Stefan » Sat Sep 01, 2001 6:03 pm

Hi Ian,thanks for your reply,
what you are saying about ?assign" and ?convert to" profile is what I thought it would be.Maybe I didn`t express myself precisely enough.Sorry for that.I also read your response to my other post.So one final question.My settings are:Photoshop 6 working space:Adobe RGB.SF 5.5.:
Kalibration,automatic,RGB,none,none,Adobe RGB,none,perceptual.My SF preview is exactely identical to what I see in PS.That`s fine.But the colors are more saturated than on the original print,that I scanned.(my monitor is calibrated with ?optical".)The saturation does become nearly identical to my original print,that I scanned,if I set the working spaces(in SF and PS) to SRGB.Why?I would prefer working in Adobe RGB AND have colors that match the original in saturation.Is this impossible?Excuse me,if this is a stupid question.Maybe I misunderstood something about colormanagement

Stefan
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Postby Stefan » Sat Sep 01, 2001 7:35 pm

Hi Ian,to make clear again,how I think colormanagement should (maybe optional) work in SF:
The data from the scanner come to SF,where the correct profile(which of course is the scanner profile,that I got from calibration) is assigned.Then a conversion to my desired working space(SRGB or Adobe RGB or whatever) takes place.So we have the scanner profile as source color space and for example Adobe RGB as target color space.This conversion normally shouldn`t change the colors of the original picture(as long as the target color space is big enough),so the color shouldn`t get more saturated,even if I would choose Wide gamut RGB as working(target) space.But if I choose different color spaces in SF(internal),the colors do change.What would be wrong about this procedere?I hope my English is good enough to express what I mean.Sorry,if not.

ilyons
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Postby ilyons » Sat Sep 01, 2001 7:46 pm

Stefan,

It's not in any sense a stupid question. The settings you chose and the fact that the results from SilverFast through to Photoshop all match indicates that the flow is correct. If I read you correctly it's the raw scan that isn't quite what you want. The saturated image relative to the orginal is what we need to figure out. I can't see your image so I can only make suggestions as to possibilities.

The gamma you chose in Silverfast - what is it? 2.2 is better than 2 and 2 is better than 1.8. It's real easy to say an image is too saturated when its really the mid tones that are too dark - this is where the gamma will take effect . Also have a look at how Relative Colorimetric looks in lieu of Pereceptual.

Also I don't know if you're working with photographs or artwork. The latter might benifit from a slightly different approach, especially if the colours are extemes. You migh try configuring SilverFast to use sRGB as your working space and when the image opens in Photoshop convert to Adobe RGB.

Ian

adagency
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Postby adagency » Sat Sep 01, 2001 7:57 pm

Sorry to but my problem seems to be the same as Stefans. In but being an apple mac user we were always told to use a gamma of 1.8 which is my setting not only in Silverfast but also for the monitor and PhotoShop. Should I change this? In the Apple Monitor calibration control one can choose between 1.8, 2.2 or uncorrected which is native at 2.2 for the apple Cinema Display.

After thoughts?
The Monitor seems to be awfully dark with 2.2 think I'll change back to my calibrated monitor profile.

<font size=-1>[ This Message was edited by: adagency on 2001-09-01 21:10 ]</font>

Guest

Postby Guest » Sat Sep 01, 2001 8:51 pm

Stefan,

This post arrived whilst I writing the last so rather than change the other one I'll just respond to this one. Never mind the English my German is awful :smile:

On 2001-09-01 20:35, Stefan wrote:

The data from the scanner come to SF,where the correct profile(which of course is the scanner profile,that I got from calibration) is assigned.Then a conversion to my desired working space(SRGB or Adobe RGB or whatever) takes place.So we have the scanner profile as source color space and for example Adobe RGB as target color space.This conversion normally shouldn`t change the colors of the original picture(as long as the target color space is big enough),so the color shouldn`t get more saturated,even if I would choose Wide gamut RGB as working (target) space.



Not quite. The first part involves the source profile which is the point at which the scanners RGB numbers get their true meaning. Once the image is converted the RGB numbers will change and it is also the case that the appearance of the image "may" change. The degree of change is dependent upon how much the gamut of the scanner profile differs from the working space you chose. When I look at the gamut map of a SilverFast scanner profile (as it would look as a working space) it nearly always just fits Adobe RGB. There might be the odd value just outside of Adobe RGB but not by much. If you tell the system that it's actually sRGB then it will desaturate.


But if I choose different color spaces in SF(internal),the colors do change.What would be wrong about this procedere?



You shouldn't really see a big difference between Adobe RGB and Adobe RGb since the scanner gamut is nowhere near that big.

I suggested in the earlier post that you might want to try setting Internal to sRGB and then converting to Adobe RGB when the image opens in PS6. This way you get what you want in SilverFast and it's still visually correct when it comes into PS6.

Ian

ilyons
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Postby ilyons » Sat Sep 01, 2001 9:10 pm

On 2001-09-01 20:57, adagency wrote:
Sorry to but my problem seems to be the same as Stefans. In but being an apple mac user we were always told to use a gamma of 1.8 which is my setting not only in Silverfast but also for the monitor and PhotoShop. Should I change this? In the Apple Monitor calibration control one can choose between 1.8, 2.2 or uncorrected which is native at 2.2 for the apple Cinema Display.

After thoughts?
The Monitor seems to be awfully dark with 2.2 think I'll change back to my calibrated monitor profile.

<font size=-1>[ This Message was edited by: adagency on 2001-09-01 21:10 ]</font>


I use a Mac and my monitor is calibrated to gamma 1.8, but my Photoshop working space is Adobe RGB and it uses gamma 2.2.

The gamma of your monitor and the gamma of your working space are only related by the term gamma. You don't need to set SilverFast to gamma 1.8 because the monitor is calibrated to gamma 1.8. that's the whole point of the Photoshop CMS and Internal Monitor - Automatic - it does the appropriate matching. As things stand you are using a gamma 1.8 for the monitor and Photoshop can handle the differences automatically, but then you tell SilverFast that you want gamma 1.8 . All this does is darken the image Photoshop nor Silverfast know anything about this value, nor do they need to. Photosshop is getting file saying hey I'm in gmma 2.2 and my name is Adobe RGB.


I just tried your settings and the image in preview with gamma set in Silverfast for 1.8 is way to dark and so my images look really saturated. I expected this but neede to be sure that I'm not peddling nonesense given the various cgnages that have been included recently.

Try setting the gamma gradation to 2.2 and put the Internal Monitor back to Automatic. This "should" fix your saturated images. Your monitor should stay calibrated to gamma 1.8.

Ian

jeez my spelling is crap

<font size=-1>[ This Message was edited by: ilyons on 2001-09-01 22:20 ]</font>

Stefan
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Postby Stefan » Sat Sep 01, 2001 9:22 pm

My gamma is set to 1.8,because when it was set to 2.2 the preview didn`t match in brightness to what Photoshop showed.Now it does.Relativ colorimetric didn`t change things.By the way I?m scanning photographs.May be the calibration target is not precise enough.I have another one,that was delivered with Corel Draw.If I use that one I get significantly different results,but worse.Here you can see,how precise(?!) those targets are measured by the manufacturers.
One more question.What does the ?internal"-setting do at last.Does it do a conversion from the scanner profile to the working space?Or does it just assign another profile?What is the difference between setting SF`s ?internal" to SRGB and then convert to Adobe RGB in PS and on the other hand setting SF`s internal to Adobe RGB?
As to your second post,which I just read now,I can understand,that choosing a workspace(like SRGB) can desaturate a picture.But can choosing a big space(like Wide gamut) oversaturate a picture?
Hi Andi,everything will turn out well in the end.

ilyons
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Postby ilyons » Sat Sep 01, 2001 11:13 pm

On 2001-09-01 22:22, Stefan wrote:
My gamma is set to 1.8,because when it was set to 2.2 the preview didn`t match in brightness to what Photoshop showed.



I cannot see how this can be. If Internal Monitor is set to Automatic and the the Internal working space matches the PS6 working space the image should be identical no matter what gamma you choose for gamma gradation. If there is a difference then the whole concept underlying the SilverFast CMS is flawed/broken and to be frank I cannot replicate what you describe on either of my two Polaroid scanners nor the Nikon or Epson. I even tried HDR, none do what you describe.



Now it does.



Does this mean that they now match with the gamma gradation set to gamma 2.2 or only when set for gamma 1.8?

Relative colorimetric didn`t change things.By the way I?m scanning photographs.May be the calibration target is not precise enough.I have another one,that was delivered with Corel Draw.If I use that one I get significantly different results,but worse.Here you can see,how precise(?!) those targets are measured by the manufacturers.



The relative Colorimetric was me thinking that you might be scanning artwork. A bad target slide shouldn't make that much difference. Colours might be off but saturation off to the extent you describe is doubtful. I'm convinced that it is a simple matter of your choice for gamma gradation. If you don't like 2.2 try 2!


One more question.What does the ?internal"-setting do at last.Does it do a conversion from the scanner profile to the working space?Or does it just assign another profile?What is the difference between setting SF`s ?internal" to SRGB and then convert to Adobe RGB in PS and on the other hand setting SF`s internal to Adobe RGB?



It depends upon what you have chosen in the Internal Scanner, Scanner Profile and Internal popups. If Scanner Internal is set to Calibrate or ICC/ColorSync it?s simply an Assign type command ? the profile is either the internal calibration profile or the one you choose in the Scanner (R or T) popup. If Calibration or ICC/ColorSync AND Internal are anything other than None then it is Convert From: scanner profile - To: Working Space. The first option is "I don't want to colour manage this document" and the second is "I do want to colour manage this document". For a SilverFast Preview to Photoshop match you need Internal Monitor set to Automatic and your working space selected in the Internal popup for both the above options. You have a third option - Everything set to None - This would be you saying "I don't want to colour manage this document and I don't CARE if the SilverFast Preview and Photoshop match". This last option is how all the crappy brain dead scanner software works.

(I reworded the second and third sentence of the last paragraph (2/9/01) in the hope that it reads better.


As to your second post,which I just read now,I can understand,that choosing a workspace(like SRGB) can desaturate a picture.But can choosing a big space(like Wide gamut) oversaturate a picture?



Assuming the working space in Silverfast and Photoshop match each other I doubt you will see much difference bewteen choosing Adobe RGB and Wide Gamut RGB. Then again I'm not sure why you see a difference with sRGB for the same reason. It's only when their is a mismatch that you should see a difference.



Ian


<font size=-1>[ This Message was edited by: ilyons on 2001-09-02 01:44 ]</font>


<font size=-1>[ This Message was edited by: ilyons on 2001-09-02 16:45 ]</font>

Stefan
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Postby Stefan » Sun Sep 02, 2001 1:19 pm

Hi Ian,
first of all,thanks for your patience.I really want to bring this to an end now.
Quote:
On 2001-09-01 22:22, Stefan wrote: My gamma is set to 1.8,because when it was set to 2.2 the preview didn`t match in brightness to what Photoshop showed.


I cannot see how this can be. If Internal Monitor is set to Automatic and the the Internal working space matches the PS6 working space the image should be identical no matter what gamma you choose for gamma gradation. If there is a difference then the whole concept underlying the SilverFast CMS is flawed/broken and to be frank I cannot replicate what you describe on either of my two Polaroid scanners nor the Nikon or Epson. I even tried HDR, none do what you describe

I don`t know,how I did it,because now I also cannot replicate it.But I know for sure,that I already 2 times had a preview that didn`t match in brightness to what Photoshop showed.So I switched to gamma 1.8 and everything
did match.Because it was a little bit dark then,I recalibrated again and everything was fine.But now if I go back to 2.2 it also workes.The preview problem didn`t have anything to do with gamma.It obviousely happened just casual.I don`t know why.Sorry,if you had to spend time to find the mistake and there was none,at least no one,that can be replicated.

Quote:
Relative colorimetric didn`t change things.By the way I?m scanning photographs.May be the calibration target is not precise enough.I have another one,that was delivered with Corel Draw.If I use that one I get significantly different results,but worse.Here you can see,how precise(?!) those targets are measured by the manufacturers.


Th relative Colorimetric was me thinking that you might be scanning artwork. A bad target slide shouldn't make that much difference. Colours might be off but saturation off to the extent you describe is doubtful. I'm convinced that it is a simple matter of your choice for gamma gradation. If you don't like 2.2 try 2!

Saturation is not off that much(I guess it was in Andy`s case),just a bit.I wish,you could see it.When I look at the different results with the different calibration targets,I CAN imagine,that it is due to the target.Whatever,I can live with it.

Quote:
One more question.What does the ?internal"-setting do at last.Does it do a conversion from the scanner profile to the working space?Or does it just assign another profile?What is the difference between setting SF`s ?internal" to SRGB and then convert to Adobe RGB in PS and on the other hand setting SF`s internal to Adobe RGB?


It depends upon what you have chosen in the Internal Scanner and Scanner Profile popups. If these are set to None then it simply an Assign type command. If Calibration or ICC/ColorSync then it is Convert From: scanner profile - To: Working Space. The first option is "I don't want to colour manage this document" and the second is "I do want to colour manage this document". For a SilverFast Preview to Photoshop match you need Internal Monitor set to Automatic and your working space selected in in the Internal popup for both the above options. You have a third option - Everything set to None - This would be you saying "I don't want to colour manage this document and I don't CARE if the SilverFast Preview and Photoshop match". This last option is how all the crappy brain dead scanner software works

That`s the way I hoped and thought it would work.

Quote:
As to your second post,which I just read now,I can understand,that choosing a workspace(like SRGB) can desaturate a picture.But can choosing a big space(like Wide gamut) oversaturate a picture?


Assuming the working space in Silverfast and Photoshop match each other I doubt you will see much difference bewteen choosing Adobe RGB and Wide Gamut RGB. Then again I'm not sure why you see a difference with sRGB for the same reason. It's only when their is a mismatch that you should see a difference

Why actually is it still necessary to have the workingspaces in SF and PS set identically?I can understand this for PS5 but not for PS6.PS 6 always displays images correct,even,if the space the image is in,is different from the space set in ?preferences" as standard working space?
But I really don`t want to bother you with more and more questions.Probably we wouldn`t find an end at all and end up in a mental home.
Last but not least I want to thank you for your efforts,because now I understand things a bit better.

Stefan
P.S.:I`m really happy with SF 5.5,maybe it didn`t seem so.

ilyons
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Postby ilyons » Sun Sep 02, 2001 2:41 pm

Stefan,

I don't know what heppened to the sentance:

"It's only when their is a mismatch that you should see a difference"

It should have read :

"It's only when there is a mismatch that you should see a difference and only if you don't have Automatic or the monitor profile selected"

With PS6 it realltyshouldn't make any odd's but with PS5 it does.

My posts and spelling went crazy last night or was it this morning, jeez my head hurts :sad:

BTW;

I wrote a whole excercise to demonstate the differences that you should see and to explain what is happening in the CMS dialog. It was in response to a post by Tomaz but now his has gone :sad: You really do want to follow it through as it will help you better understand what is happening when/where/why.


So far as the preview mismatch is concerned - this can happen if you change somthing in SilverFast and don't do a new prescan. If you change ANYTHING do a new prescan.

Ian (still trying to spell <g>)






<font size=-1>[ This Message was edited by: ilyons on 2001-09-02 15:47 ]</font>


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