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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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.

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)
            float l_black = (float)1.0 - p_colorvalue[3];
            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]);
        return (l_res);
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

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 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

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

Convert "Grayscale I16" to "RGB U64"

Hello,
I need to convert an image from Grayscale I16 to RGB U64, but it doesn't work (I have joined a zip file).
I think there is a bug in the NI Vision, or it's not implemented because I have no problem to do it from Grayscale U8 to RBG32.
Can you help me to find a solution to do that?
I need to use ReplaceColorPlane function or equivalent because I have to perform various treatments on each layer (RGB).
Thanks
Solved!
Go to Solution.
Attachments:
tests.zip ‏217 KB

Hi Badgones73,
The U64 image is composed of four U16 values (R, G, B and alpha). LabVIEW represents 16-bit images as an I16. When the IMAQ Extract Color Planes is called, the U16 value must be converted into I16 values. This is done by converting all values with a MSB of 1 to a value of 0. This means all the values from 32,768 to 65,535 are now 0. To avoid using losing these values, you must read the image into LabVIEW without using the vision functions.
Once you have extracted the U16 values, they can be converted from U16 images to I16 images. Once this is done, you will be able to use all of the Vision functions.
Also, i invite you to read the information on our website:
How Do I Convert a Color Image to Grayscale?
http://digital.ni.com/public.nsf/allkb/ED42C55C29B9B34C862570A60079952E?OpenDocument
Regards,
Rémi D.
National Instruments France
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>> Les rencontres techniques de NI - Mesures et acquisition de données : de la théorie à la mise en ...

Grayscale to RGB

Hello,
I am trying to convert a grayscale image (pixelBits = 8 numComponents = 1) to an rgb image (pixelBits = 24 numComponents = 3).
There are many tutorials to convert RBG to grayscale but not the opposite...
Any idea ?
Thanks.

Hi Yann,
Thanks for your useful post.
Unfortunately there's still little defect : result operation colormodel is not explicitly specified, which leads to strange background rendering when using backgroundValues parameter in "rotate" operation.
So here the enhanced code :
PlanarImage src = JAI.create("fileload", "Photo.jpg";);
System.out.println(src.getColorModel());
// Prepare operation parameters
double[][] matrix = {
     { 1.0D, 0.0D },
     { 1.0D, 0.0D },
     { 1.0D, 0.0D } };
ParameterBlock pb = new ParameterBlock();
pb.addSource(src);
pb.add(matrix);
// Prepare rendering hints
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
ColorModel cm = RasterFactory.createComponentColorModel(
     DataBuffer.TYPE_BYTE, cs, false, false,
     Transparency.OPAQUE);
SampleModel sm = cm.createCompatibleSampleModel(image.getWidth(), image.getHeight());
ImageLayout imageLayout = new ImageLayout();
imageLayout.setSampleModel(sm);
imageLayout.setColorModel(cm);
RenderingHints renderingHints = new RenderingHints(null);
renderingHints.clear();
renderingHints.put(JAI.KEY_IMAGE_LAYOUT, imageLayout);
// Perform the band combine operation.
PlanarImage dst = (PlanarImage)JAI.create("bandcombine", pb, renderingHints);
System.out.println(dst .getColorModel());

Grayscale to RGB Confusion

Hi guys, please try this:
1) new image, grayscale
2) fill (say 96,96,96)
3) image->mode->rgb color
The pixels will be (95,95,95) and (96,96,96) when they should *all* be the same.
It also happens when you paste a black & white image into an RGB document because even though it has three 8-bit channels (by definition not grayscale) Photoshop decides to make it grayscale.
Is there a way to correct this ?
Thanks.

Hi,
My Color Settings are set to Monitor Color, and the Proof Setup is set to Monitor RGB.
I don't see any settings for dithering.
When I say Black & White (as opposed to Grayscale) I mean a 24-bit RGB image that has only gray (R=G=B) pixels. If I paste that into an RGB document I get pixels that are not consistent, if I paste it into a grayscale document the pixels are consistent but become inconsistent when I convert that document to RGB.
What should I do ?
Thanks for trying to help.

Converting grayscale to black & white

I have a sketched out map of a parking lot that I want to convert to a true black and white. Can someone please tell me step by step how to do this?
Thanks...

Curvemeister told you how to convert from RGB to grayscale. And by the way I think the new(ish?) black and white adjustment layer does your trick in one adjustment. Please correct me if I'm wrong.
Max:
To move from grayscale to "true black and white" (bitmap), you can use the layer...new adjustment layer...threshold and move the slider. Personally, I like to upsample the image some, as bitmaps have no gray tones to smooth lines out. Your target resolution should be 450-600 ppi at the size you will print. Of course, you can go higher... You can upsample using bicubic smoother and then use the threshold adjustment layer. When you're happy with how it looks, just image...mode...bitmap it and you've got a true black and white.
Of course if your image is photographic, you might want to turn it into "line art," which is kind of a different thing. If you try the threshold adjustment layer on a photo, you'll see what I mean.
Be sure to save as, or dupe the file before you begin!
J

Plugins for converting Grayscale to neutral CMYK?

I've some B&W images that were processed as RGB, turned to Grayscale, and eventually need to be CMYK. They're being printed in a magazine, and it's important that they don't have a weird color cast. I feel a straight convertion from Grayscale to CMYK will put color information back into the B&W image.
Does anyone know of any plugins that will pull this off effectively? I hear the manual way to go about it is having just the black channel in all highlights and midtones, and some color in the shadows. That gives it rich depth without any colour cast. I'm not sure how to go about it though.
Thanks in advance!

A »dirty« method would be to use a Custom CMYK-conversion (Edit > Convert to Profile) with Maximum GCR and then just use Edit > Assign Profile to attach the proper CMYK-profile.
Maybe use an Action or Script to automate this.
Edit: The Dot Gain should be the same as the Grayscale’s.

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

Convert CMYK to RGB for MS Word?

Greetings! I've designed a logo for a client using Illustrator CS6. There is the 4-color version in CMYK .eps as well as 1-color, 2-color, and KO versions. Everything looks and acts as it should and will no doubt be perfect for offset printing (my main area of experience). However, once delivered to the client they were anxious to put them into use and immediately dropped the 4-color version into a word document and made a pdf for email distribution. When I received it I had to groan, the colors had shifted to the obscene.
My guess is that what the client needs is a set of the logos that are converted to RGB. I'm also thinking that since the logos might be re-sized for various uses, keeping the art in the .eps format (as opposed to a raster format) makes sense. Is that true?
And,
Is there an easy way to convert the original CMYK eps files to RGB within Illustrator?
I'm wide open to suggestions for best practices regarding artwork for use in MS Office applications.
Thanks!
Tim

Since you're already familiar with a print workflow, your profiles are probably correct for this conversion. The only caveat would be how Word deals with color. I don't use Word, so I have no idea about that. Best practice would be to learn how your client is going to use the files you supply, and test each application.

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.

Why different values in Illustrator/InDesign/PS when converting Pantone to RGB & CMYK?

I'm starting off with a pantone color in InDesign and trying to determine a close and consistent approximation of RGB, CMYK, and Hex. When I do this conversion in InDesign, I get different results than if I do it in Photoshop or Illustrator. I have all the apps working at the same color management setting (Adobe RGB (1998) and US Web Coated (SWOP) v2). I'm working old school in CS1.
Here are my results for Pantone 187C:
InDesign
Photoshop
Illustrator
RGB
171 x 0 x 34
153 x 33 x 55
167 x 37 x 53
CMYK
0 x 100 x 79 x 20
21 x 100 x 81 x 12
16 x 100 x 86 x 6
HEX
992137
A72535
I realize that any conversion from Pantone is an approximation, but why do the different applications yeild different results? I'm fairly new to color management and print (I come from the video world), so any efforts to dumb down explanations are appreciated.

Photoshop's default is to use Lab values when converting from spot colors. So you need to set InDesign and Illustrator to use the same values.
In Illustrator, from the Swatches panel menu, choose Spot Color Options. Choose Use Lab Values specified by the book manufacturer.
In InDesign, from the Swatches panel menu, choose Ink Manager. At the bottom, check Use Standard Lab Values for Spots

Converting Grayscale To RGB

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