Converting sRGB to RGB in Batch

Good morning from Germany!
Has anybody an idea, how to convert sRGB to Adobe RGB in Batchmode?
I have to convert 2000 pics, would be a little bit too much work.
I have elements 7.
Greetings
Frank

But you never loose Information, when you convert from something to Adobe RGB. When you convert it, the information will be the same.
If that were true, then if you converted an sRGB image to an Adobe RGB image, you would end up with the exact same image. And if you then converted that image back to sRGB, you'd still have the same exact image. But you can easily show that this isn't the case, with the following experiment:
1. Start with a typical sRGB image:
http://www.pixentral.com/show.php?picture=1TpSRYzXPRQWcz8x1Dr9pnGJCi88yZ0
2. Convert the image to Adobe RGB using Image > Convert Color Profile.
3. Convert the image back to sRGB.
4. Combine the original image from step 1 and the doubly converted image from step 3 as layers in a new image, with blending mode of Difference.
If the original and converted images were identical, the difference in step 4 would be all black. But in fact, if you invoke the Levels command, you can see that many of the pixels are not quite black. If you shift the Levels white point to the left, that will highlight the differences, as seen in this screen shot:
http://www.pixentral.com/show.php?picture=1uEu9m1OjVgb2JSvx6dQ6pkHvSnWv0
If you think about this mathematically, in JPEGs both color spaces use 8 bits per pixel for each of R, G, and B. Thus, each color space has exactly the same number of distinct colors (different values for R, G, and B), 16.7 million. The Adobe RGB colors are spread out over a wider gamut than sRGB, but sRGB has more, finer shades of colors within its narrower gamut. Since both spaces have the same number of colors, and since Adobe RGB has colors that sRGB does not, then it must necessarily be true that sRGB has some colors that Adobe RGB does not. Thus, if you convert an sRGB image to Adobe RGB, some colors will be changed to their nearest Adobe RGB colors, which aren't exactly the same.

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New ICC v4 sRGB Color Space May Prevent Clipping Converting From ProPhoto RGB

Just discovered and tried out this new sRGB color space downloaded from this page:
http://www.color.org/srgbprofiles.xalter
Here's a cropped demo with histograms of a raw image I've been working on in ProPhotoRGB in ACR 3.7 and CS2:
http://www.flickr.com/photos/26078880@N02/2874068887/sizes/o/
Please disregard the PRMG name in the demo. I got confused as to which was which on that site and thought that this version of sRGB was a PRMG=(Perceptual Reference Medium Gamut) profile. It's called sRGB_v4_ICC_preference.icc.
Note the different color shifts using the Perceptual intent and unchecking Black Point Compensation=(BPC). Neat little features embedded in this profile, but not sure about how it renders certain colors close to clipping in the shadows. That site doesn't recommend mixed use of ICC v4 with v2 color spaces and output device profiles but I did it anyway just to see what it does.
Who knows this may be the equivalent of handing scissors to children, but I'm just one of those curious children and thought I'ld share anyway.

I'll try to respond to a few items above.
The digital values in a Pro Photo RGB file should generally be the same as for a ROMM RGB file. The exception is that all possible Pro Photo RGB values are "legal" but not all ROMM RGB values are "legal." ISO 22028-2 restricts the legal ROMM values to those with PCS LAB values between 0 and 100 L* and -128 to +128 a* and b*.
There is no enforcement if you use the illegal values in a ROMM file but as some of these values do not represent possible colors this is not advisable. I think it is good practice to try to stay mostly inside the ICC v4 PRM gamut with Pro Photo/ROMM images. You can check this using the gamut warning profile on the ICC site.
If you have a Pro Photo RGB image you should just assign the ROMM profile to it. Converting to ROMM RGB should not change anything in the ideal sense but there is the possibility to introduce rounding errors and mismatch black points.
The main difference between the Pro Photo RGB profile and the ROMM RGB profile is the former includes black scaling to zero (as is common with v2 color space and display profiles) and the latter does not (as is required with v4 profiles).
In the duck picture, the reason for the difference is the ROMM profile black is at L*=3 so this is where the lowest blacks land when converting MRC to v2 sRGB (which has the sRGB blacks scaled to L*=0). In this case leaving BPC off is analogous to turning on "Simulate Black Ink" in Photoshop Proof Setup.
All the ACR color space choices are v2 profiles with black scaling. If you want a v4 profile embedded you have to assign it (if you have a corresponding v4 profile) or convert to it.
Both the sRGB and PRM gamuts fit within the ROMM RGB legal encoding range, but if you use a v2 profile with black scaling you should always turn on BPC when combining with a v4 profile. Otherwise the v4 profile will think the v2 profile represents a device with an infinite dynamic range. When BPC is on the Color Engine scales the black point of the source profile to the black point of the destination profile.
The sRGB gamut extends outside the PRM gamut in some places, and the PRM gamut extends outside the sRGB gamut in other places. If you convert using a colorimetric intent in either direction some of the gamut will be clipped. The purpose of the sRGB v4 perceptual transforms is to minimize clipping in both directions.
I can't do this justice here but basically scene-referred images are encodings of the scene colors and output-referred images are encodings of the picture colors on some medium for which the picture colors have been optimized. You can make a scene-referred image by setting the ACR sliders (except the white balance sliders) to zero and the curves tab to linear. You make an output-referred image when you adjust the sliders to non-zero values to make a nice picture as viewed on some medium. For example you might adjust the sliders differently to get the best results printing colorimetrically on glossy photo paper vs. on plain office paper.
Often an important part of the transform to output-referred includes a midtone contrast and saturation boost. While there will likely be some highlight and may be some shadow compression, it is misleading to think of this transform only as a compression to some output medium dynamic range. In some cases the output medium dynamic range is larger than that of the scene.
Usually the transform to output-referred is more complicated than a simple gamma function.
Regardless of the image state (scene-referred or output-referred) the sRGB, Adobe RGB, or Pro Photo RGB nonlinearities will be applied to create the image data that you open into Photoshop.
We are working in the ICC to prepare more information for posting on this topic.

How to convert CMYK to RGB programmatically.

Hi,
I have a CMYK colorspace in indesign, i want to convert that as RGB color space, I got some codes, but I am getting incorrect data.
Some of the codes which I tried are given below
        double cyan = 35.0;
        double magenta = 29.0;
        double yellow = 0.0;
        double black = 16.0;
        cyan = Math.min(255, cyan + black); //black is from K
        magenta = Math.min(255, magenta + black);
        yellow = Math.min(255, yellow + black);
        l_res[0] = 255 - cyan;
        l_res[1] = 255 - magenta;
        l_res[2] = 255 - yellow;
@Override
    public float[] toRGB(float[] p_colorvalue) {
        float[] l_res = {0,0,0};
        if (p_colorvalue.length >= 4)
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            l_res[0] = l_black * ((float)1.0 - p_colorvalue[0]);
            l_res[1] = l_black * ((float)1.0 - p_colorvalue[1]);
            l_res[2] = l_black * ((float)1.0 - p_colorvalue[2]);
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The values are C=35, M = 29, Y = 0, K = 16 in CMYK color space and the correct RGB values are R = 142, G = 148, B = 186.
In adobe indesign, using swatches we can change the mode to CMYK or to RGB.
But I want to do that programmatically, Can I get any algorithm to convert CMYK to RGB which will give the correct RGB values.
And one more question, if the alpha value for RGB is 1 then what will be the alpha value for CMYK?
Can anyone help me to solve these issues... Thanks in advance.

All you have to do is loop thru the swatches and change the space to RGB. Below is an AppleScript, but it shouldn't be too difficult to come up with the equivalent JavaScript. Your document's assigned RGB space will determine what RGB space the CMYK converts to, so if you are looking for sRGB, then Edit>Assign Profiles...>Assign Profile: sRGB
tell application "Adobe InDesign CS3"
tell document 1
repeat with a from 1 to count of every swatch
try
set space of color a to RGB
end try
end repeat
display dialog "All swatches have been converted to RGB color"
end tell
end tell

How does Photoshop convert LAb to RGB values?

I'm working on a project and the only way to obtain RGB or LAB values is my using the color picker. I don't want to have to do that manually everytime i need an lab to be converted to a photoshop RGB. I need to know how that is computed.

First, there's no such ting as "RGB" to convert to, only specific RGB color spaces such as sRGB, Adobe RGB or ProPhoto. You get different values in all of them.
As it happens Lab values are always available through the Color Management Module. Lab is one of two profile connection spaces used in all color management operations (the other is CIE XYZ). For instance, as you view the image on screen the RGB values in the file are constantly calculated as document profile > Lab (or XYZ) > display profile.
These are complex calculations and good luck doing it manually. The easy way is to use the color picker.

How can I convert Pdf from RGB to CMYK, keeping font color 100% K while working in Illustrator?

How can I convert Pdf from RGB to CMYK, keeping font color 100% K while working in Illustrator?
When I try to open the document in Illustrator and I convert to CMYK the black font converts to rich black, but to set up for Offset printintg I need the text to be only in Black (100%K).
The original source of the document is a Microsoft Word file, I have converted the Word file to Pdf in order to setup for OFfset Printing.
Thanks

I have tried that way, but the downside is that the fonts are set in gray not in a 100%K, also I have to deal with other fonts that are composites and meant to stay Full Color. I could select text by text and convert to gray but, its a 64 page document and I wouldn't want to make a expensive mistake.

Converting from finished products non-batch to batch management

Hi guys,
Can you tell what is the best strategy to convert a system from non-batch managed to batch managed for the finished and salable product? Batch management should have been implemented from the start, but my client just realized that mistake. This is knowing that we already have inventory and all kinds of transactional data: purchase orders, sales order, production orders...
I am looking for the less painfull strategy, as detailed as possible.
Thank you.
Fotso

Its going to be painful.............
1) Reverse all material stocks. Create a new cost center and consume the available stocks to that cost center using 201 mvt type.
2) If there are any open sale orders for that material delete the line item in those sale orders.
3) Update the batch management indicator in the material master.
4) Add back the material in the respective sale orders.
5) Post the stocks with batches by reversal mvt type 202 from the cost center.
Regards,
GSL.

How to convert YUV to RGB

I need to convert the YUV values to RGB. What is the formulae to convert? YUV values in the ratio 4:2:2. First I read it from a YUV file,then
convert it to RGB. Then make an image(JPEG) from this values. How can I do this?

http://www.fourcc.org/fccyvrgb.php
First result in google...Like I said, no initiative what so ever!
The OP is a goldmine of post like these, I forsee that he's about to start a major project that he's incapable of and get the forum to complete it for him

When converting RAW to Jpegs in Batch converstion, I'm getting 2 copies of everyone. Why??

When converting RAW to Jpegs in Batch converstion, I'm getting 2 copies of everything. Why??

Oops, so you did. I must have been on auto-pilot
I don't have any of those tracks in my library so I can't tell you that any of them work for me. If Genius works overall then it's probably a matter of sampling a critical mass of playlists that already contain those songs, for it then to be able to suggest suitable "mixes". I've not tried to get to grips with the mechanism behind Genius but I'd guess it works something along these lines. Your library gets inspected and some kind of summary gets uploaded to a server which integrates data from lots of users, and then gives you some back. Perhaps the process just does take time.
tt2

Convert image from RGB to CMYK and back to RGB

Hey.
I wonder if anyone has experience with converting image from RGB to CMYK and back to RGB?
I had a TIF in RGB then converted to CMYK but I figured that it might be better to keep in RGB, so I converted back. I read that it supposed to cause some loss in the data, but I can't see anything on the image, it is still very huge and the 2 RGB files has the same size as well. Is there a way to compare the resolution of 2 images somehow, or how can I see what I lost through the 2 conversions?
Thanks for help

I had a TIF in RGB then converted to CMYK but I figured that it might be better to keep in RGB, so I converted back.
The original RGB data is not being restored by converting from the CMYK version, so the term "keep" seems inappropriate.
What are the actual Color Spaces (ICC profiles) involved?
Is there a way to compare the resolution of 2 images somehow, or how can I see what I lost through the 2 conversions?
How did resolution come into this?
To determine how large a portion of the image has been changed you could
• make a flattened copy of the original image
• place a flattened copy of the RGB->CMYK->RGB image on top of that and set it to Blend Mode Difference
• add an Adjustment Layer (Curves for example) to brighten the image

IPad - Digital Magazines, converting PDFs to RGB.

Hello everybody,
I happen to be setting up a workflow for some printed magazines in italy, that launched digital editions of the magazines online (Classic browsers but also iPad app). Basically they need their prepress pdfs to be published on an online interactive application.
Here it is so far:
1)     Get PDFs from Prepress: 300dpi - Iso Coated FOGRA 39 - minimum 5mm bleed on each side - v1.3 Acrobat 5.0.
        Usually 200-300pages - usually pretty heavy (1-2gb). Usually around 100-150 separate and numbered PDFs.
2)     Create a single PDF file with Acrobat 9.0 from all the prepress files.
3)     Run a little script I found online (Crop Pages) that basically sets all the boxes (CropBox,MediaBox,CropBox...Etc) to a certain size.
        Basically it's a little tool that anchors a certain box size centered on each page, and crops it.
        Not very accurate, but better then manually cropping 300 pages.
4)     Run Preflight on document: Online publishing (Optimize for quality). Analyze and Fix. This drastically reduces file size.
        PDF Version is upgraded to 1.6 Acro 7.0
5)     Run Document Processing: Create links from URLs. This basically creates acrobat link areas wherever it finds a www.xxxxxx.com format.
        (absolutely mandatory, they want their digital magizine to be fully interactive)
6)     Briefly check for errors, missing links, etc. Run preflight for page size and CMYK objects (they make the iPad go nuts).
7)    Manually add videos and galleries and the rest of the interactive objects. Afterwards, send the PDF to web agency.
Despite the whole ordeal, there's still lots of things that aren't working!
On point 1 all the pdfs I receive present the infamous 1px white hairlines in between trasparencies of the 1.3 pdf version.
Most of them disappear upgrading to Acrobat 7.0 but some of them make it all the way to the iPad edition!
Is there any known way to get rid of this 1px white hairlines once and for all?
On point 3 the tool I use to crop the PDF pages is pretty rudimentary and not very trustworthy.
It forces me to double check every single page to be cropped the right way.
Is there any known tool that can set (in batch) all the boxes, especially Media and CropBox to the size of the TrimBox?
Can it be developed? The Idea is 1. Get Trimbox - 2. CropBox=TrimBox- 3. MediaBox=TrimBox on each page.
On point 4 the preflight profile does an awesome job all by itself and during the process it converts all the CMYK in RGB.
Despite this, the colors seem to look dull. I understand this is because, being printed magazines the CMYK colors are for printing purpose
and can't be as bright. Converting (relative colorimetric) I get kind of washed out colors.
Is there a conversion method that can boost the saturation/clarity of my RGBs in the PDF?
This is to get their online application to be a little more "attractive". It's a shame to not take advantage of a bigger colorspace (RGB).
On point 5 last but not least acrobat creates rectangular link areas that in most cases do their job but completely mess up on
curved or oblique text. Basically if the link follows a circular path or lays on an angle acrobat creates this massive rectangles around it.
Is that it? Just plain rectangles?
Is there a way, in acrobat or even in indesign, to create circular or polygonal shapes for the link areas?
Sorry for the epic length of this post.
Hoping that this could be helpful to others (There seems to be no info about this stuff on the internetz),
I thank you all in advance.
I can provide screenshots if needed.
A

Hello, A
As you have been said, if you start with that kind of flattened PDFs, it's rather difficult to reach an apple-pie PDF for what you want: everything is chopped-up. If you could set a workflow where the original creators of the PDFs would generate a second batch of PDFs for the web, that would be the best and, in the end, the easier system.
In any case, the odd washed-up colours are usually due to a bad setting of the colour management at the time of making or repurposing the PDF. With a proper set up, aiming at sRGB should render a PDF that looks on screen rather similar to the printed final version (taking into account a reasonable screen, not a madly wacky one, of course).
You do not specify what is the software used to arrange content and to make the PDFs, but I guess that, if the magazines are 'big enough' (that is: they are not a some kind on enhanced newsletter), you could even set some kind of automated workflow (take a peek to tools like Switch —Enfocus— of PDFColorconvert —Callas—) that would be extremely easy to use.
As for the interactive side of your questions, you'd be better served if you make this kind of questions in a forum like the Acrobat, Dreamweaver or Flash ones.
Hope it helps
Ciao

How to convert sRGB images to CMYK retaining icc profiles?

I was given the follwoing info. but not sure it answers fully - it still doesn't resolve the problem of converting to CMYK with the icc profile. I think this might be an option if the profile is loaded into the colour setting (colour settings under edit menu as oposed to convert to profile and its convert to profile I have been trying to action. Am I missing something straightforward?
thanks!
you can do batch process in Photoshop
http://help.adobe.com/en_US/photoshop/cs/using/WSfd1234e1c4b69f30ea53e41001031ab64-7427a.h tml
-There is a fast and easy method to batch convert many RGB photographs to CMYK files by using Photoshop
-Please open an image, then open the Action Tab (Window > Actions)
-Please click 'Create new action' button, name the action in the text field and click the 'Record' button.
-Now it is recording, so select 'Image > Mode > CMYK Color', then hit the 'Stop' button in the Action Tab.
-The action is now created ready for the next step.
-To batch convert a folder of images, just select 'File > Automate > Batch' and the following window opens.
-Choose the 'Convert RGB to CMYK' action from the drop-down list, choose the source folder where your images are stored, then choose a destination folder where Photoshop will save the converted images.
-Click the 'OK' button and the batch process will start. How fast will depend on the number of images that need converting.
-The action you created will be stored, so you only need to perform a new batch process the next time you need to convert a batch of images.

I think we may need a little more information to fully address your question or issue. sRGB and CMYK are two very different color spaces, and converting from one to the other requires significant shifts in color. Are you refering to a specific input or output icc profile?

Convert cmyk to rgb in acrobat 7

Good morning,
I have a question about converting color spaces using Acrobat 7 Professional and Pitstop Pro.
I have some CMYK PDFs used for magazine printing that I need to convert to a 144 DPI RGB version for a digital edition.
I know most folks are concerned with RGB to CMYK but I need to do it in reverse...
If I do a Convert Color in Acrobat CMYK to RGB it looks a lot better than if I do it using an Action List command to Convert to RGB in Pitstop.
The Pitstop ones look almost posterized, way darker with significant color shifts
I would have thought Pitstop would use the Acrobat color engine to do the transformation to RGB but it seeems it knid of does it's own thing.
I do have sRGB selected in my Color Management Prefs in Acrobat.
It would be nice to make this RGB second version PDF with Pitstop and Distiller on our server so it runs more automated, less manual intervention...
thanks for any advice you have,
Pat

I think I stumbled across the solution... there are separate Color Management Preference controls for Pitstop.
I selected sRGB instead of the Enfocus Default RGB.

Converting Grayscale To RGB

I am trying to add some B&W photos that I scanned. In a previous post I was advised to convert any grayscale pix to RGB. Is there a way to convert using os x 10.3.9? I think I figured it out in photoshop. When I open the pic in preview and select "get info" the profile reads "sRGB IEC61966-2.1". Is that ok? Someone please help lol. Thanks in advance.

Yes the sRGB profile is fine.
Regards
TD

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I've just received my third photobook. We make one each year and the previous ones have been great. I already found out that it's advised to use only sRGB images. Since there are no warnings when importing with another profile or any profile-conversions, my 100+ euro book has some very dark pictures.
I'm not satisfied by the result. I'm no noob to colour (as a graphic designer) but is it so hard to check for a profile and convert it? It looks good on screen but the print looks bad.
Anyone had this issue before?

Contact Apple - http://www.apple.com/benl/support/photoservices/returns/
As to has anyone else seen this issue - yes - pretty much anyone who uses Adobe RGB has the issue of dark prints - if you want to avoid that then you have to avoid using Adobe RGB - http://en.wikipedia.org/wiki/AdobeRGB_colorspace - It is different than the sRGB color space - http://en.wikipedia.org/wiki/SRGBcolorspace - and is not compatible with the Apple printing service
The sRGB color space is well specified and is designed to match typical home and office viewing conditions, rather than the darker environment typically used for commercial color matching.
Ergo - use the Adobe RGB that is designed for commercial color matching and things will be darker
expect it - it is what it is - and don't use it if that is not what you want. It is not an error or wrong - but it is different and if you choose to use it then you will get the predictable results.
LN

DNG converter converts RAW Adobe RGB color profile to ProPhoto ??

I have a Canon 5D2. there is an internal switch to shoot RAW files using the Adobe RGB profile. when I open a RAW image in CS4, there is no problem. yet when I open the DNG converted image in CS4, CS4 tells me the image has the ProPhoto color profile. I can convert back to Adobe RGB, but it adds an extra step and (I think probably) loses information. I looked for a switch in the DNG converter to speciy the color profile of the converted image, but could not find it. Any suggestions ?

Hi, Tom.
The real issue here is getting accurate color. You can't get accurate color by setting your monitor profile to sRGB. sRGB is a virtual color space that doesn't describe the exact color gamut of any physical device. But, in order to display sRGB or any color space accurately, you need to get a characterization of your monitor.
Here is an AWESOME way to get access to a colorimeter: http://www.lensrentals.com/rent/pantone-huey-colorimeter Looks like for $32 you can rent this for a week. Go in on this with a friend and profile both of your monitors and hardly pay a thing. If you have a reasonably good quality LCD monitor, this custom profile you make will be fairly accurate for many months. At the very least, this is way more accurate than having no regular calibration at all.
Hope this helps!
Bret

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