Converting from RGB colorSpace to cs_gray

Pls can anybody help with the conversion from sRGB to cs_GRAY
i have been trying to convert but the registry says the samplemodel is not compactible the colormodel

I am replying to this topic again in the hope someone will be able to help with step 2 of the subject question. In one of the replies, Michael offered a VI utilizing nested loops to convert the 32 bit array containing RGB values to Cielab Lab values. Because of the extensive computations required for digital images of significant pixels, the cited nested loop approach requires to much computation time (i.e., approximately 30 seconds) when a steady stream of images need to be processed. I believe there exists another Labview approach that will allow the conversion of all the pixels' from RGB coordinate color space to Lab coordinates allowing histrographs to be plotted for the respective L, a, and b distributions. I would appreciate help from an NI engineer or anyone who is familiar with a more efficient colorspace conversion approach for all pixels of a digital image.

Similar Messages

Convert from RGB to CMYK

I've been trying to find solutions to convert images/pdf's from RGB to CMYK. I've noticed that it's definitely possible to convert from CMYK to RGB, but haven't been able to do the reverse.
Does anyone know of a method or a reference that might help me along?
Thanks!

Ugh, I'm a newb and did a better search and found other previous posters asking the same question.
Feel free to close this thread (if you do such things here).

Converting from RGB to CMYK makes the image dull. How do I fix?

I have an image that has a really bright vibrant blue in it. When I convert it from RGB to CMYK, it gets pretty dull. Is there a "trick" or something to do to a file after converting to CMYK to bring back some of it's vibrancy?

Sharingene wrote:
Question on workflow... so do I convert my sRGB to CMYK, work to fix different color issues using some of the methods above, then what? Where does the printer's profile come into play during all of this? UPrint told me for offset printing they use US Web-coated SWOP v.2. Just not sure what to do with this information
Whenever you convert, you're always converting from the source color space to the destination color space.
In this case, your source color space is sRGB, because that's the color space your file is in.
Your printer told you that the CMYK profile they use is USWebCoatedSWOPv2, so that's the destination color space you want to convert to. You can consider that the printer's profile.
So, how to convert?
There are two ways.
First, you could go to Image > Mode > CMYK. Easy, but maybe not right.
That method will convert to whatever defaults are set in Photoshop's Color Settings (Edit > Color Settings). Check out your Color Settings. If they are set to any of the North America presets, you're in good shape, because the CMYK default is USWebCoatedSWOPv2. However, let's say that the printer told you to use Web Coated SWOP 2006 Grade 3. Then you need to take a different approach...
Second way: go to Edit > Convert to Profile...
In the dialog that appears, click on the Destination pop-up and scroll to find the appropriate profile.
Click OK. Conversion done.
This is a more deliberate method that also gives you control over Rendering Intent. (That's another discussion. For now, use Relative.)
-I guess it's used in soft proofing but sure how all this works. If I soft proof and it's still not looking right, am I able to edit with their profile turned on some how?
A soft proof is an on-screen simulation of what your color will look like once you do the conversion. In your case, you would turn on soft-proof (command-Y) while still in sRGB to simulate the look of the CMYK color space.
To select the color space to simulate, go to View > Proof Setup.
Click on Custom...
Click on the Device to Simulate popup.
Scroll to find the destination color space.
Then when you hit command-Y, you'll see a soft proof of that color space.
Best practices suggest that you do the bulk of your color correction while still in RGB, but with soft proof on.
Also, should I get a profile for the paper I'm using as well?
That's what the printer's profile is.
Although I've read somewhere it's hard to have your monitor replicate paper because monitors are so bright....
Not exactly. The challenge in getting a visual match between monitor and proof/print is based on the fact that a monitor is emissive (i.e., it's a light source) and a print is reflective (i.e., it only reflects light that's hitting it.) However, in a proper, well controlled editing environment, it's possible to get a shockingly close match between monitor and proof/print. All the variables are controllable.
The bottom line with all of this is to be able to get accurate, predictable color on press (or out of your inkjet) based on what you see on screen. It can be done; I do it every day. It just takes some study and rigorous process control.
I humbly suggest that you check out my book.
Good luck!
HTH,
Rick
Rick McCleary
author, CMYK 2.0: A Cooperative Workflow for Photographers, Designers, and Printers
Peachpit Press

Text reflow when converting from rgb spot color to process black

The setup that I'm using is a G5 Mac OSX, version 10.4.11. The InDesign application is CS3, version 5.0.3. The fonts are loaded into Extensis Font Reserve, server 1.7.4. The InDesign document has a text box using 2 different font sets. One set, Helvetica Neue, uses the rgb spot color. The other one, a mixed set of New Century Schoolbook, is used for a paragraph which is process black. When deleting the rgb spot color from the swatches and converting it to process black, the New Century Schoolbook reflows which had already been process black.
If I just select the Helvetica Neue type and change that line to process black there is no reflow problem.
When I tried this document on another Mac with the same set up there was no reflow. Is this an InDesign preference problem? Thanks

If you change the color back and then back again, do you get more reflows?
The reason I ask is that when InDesign opens a document, it holds the existing composition of stories until you apply any edit. So, it could be that what you're seeing here is that yours and your user's setups are different enough that reflow is inevitable the moment you edit the text, and changing the color counts as editing.
Dave

Automatically convert from RGB to CMYK color mode

I have over 900 barcodes provided in EPS format. When I open them in illustrator, they are coming in as an RGB color space file. I need them gray scale solid black in CMYK color mode. I can batch using actions to convert the artwork using "Edit Colors > Convert to Grayscale". However, the document color mode remains RGB. It appears, even after using "Convert to Grayscale", that the RGB color mode goofs up the placed .ai file in InDesign, treating it as RGB and seeing it as a mix of CMYK rather than the 100% black only it needs to be for proper sharp printing.
The actions pallet doesn't record converting the document color mode. Is there a way to automate that file conversion so they are all saved as CMYK rather than RGB, or am I stuck opening each of the 900+ files manually?

While recording the action, from the popup menu in the Actions Panel choose Insert Menu Item, then from the main menu choose File > Document Color Mode > CMYK color.

Converting from RGB to CMYK alters shadows

When working with our product photos, I keep them in RGB and add drop shadows to them by drawing rectangular marquees on a separate layer, fill them with black and then apply gaussian and motin blur to them. Works quite well. Plus with the shadow on it's own layer, I can turn it off in InDesign if need be. The problem is when I convert the photo to CMYK for offset printing. It's asks if I want merge the layers to which I say no since I want to be able to turn the shadows off if need be, but when I say no, then the shadows get bigger and do not look as good as they did in RGB. If I say yes to merge, then the shadows look the same as they did in RGB but I lose the ability to turn them off in InDesign.
Is there a way to keep the shadows looking the same when converted to CMYK without having to merge the layers? Using PS CS6 64 bit. Thanks.

gator soup wrote:
... i would think any conversion would be subject to the same anomaly that Photoshop is showing
but i don't know... maybe convert to the destination cmyk before setting any layer effects or adjustment layers
Effects, like gradients, drop shadows, etc are not converted by the color management pixel by pixel because Photoshop doesn't see them as pixels but as a procedure (formula) with key colors for generating the effect in the destination color space. So, for drop shadow, only the shadow color is converted to its closest match in the destination color space but all other parameters affecting the color like the blending mode, opacity, etc are applied in the destination color space which gives different appearance - first, because color space characteristics like gamma curve is different and second in case of a different model (CMYK), the blending of colors is based on entirely different algorithms.
So, basically effects is best to be recreated in the destination color space or flattened before conversion.

Color turns Grayscale when converted from RGB to CMYK?!

I have a complex pattern, that looks brilliant with a color layer. However, it was originally created RGB.
I converted the color to CMYK for print, and all the color disappears! Not that the layer is deleted, but the color layer appears Grayscale. The only area where color shows up are in the pieces that are at 50% transparency (see purple diamond). I have all my color areas set to CMYK including the color pallet.
The color will show if I set the layer to multiply, but it doesn't look the same way as it does when its in RGB mode.
I've never come across this before, any help would be greatly appreciated! THANKS!

If I do this, it turns it into an image and it loses its clipping path?

Converting from RGB to CMYK

A client gave me a PNG made in Fireworks, and I need to pretty much convert this over to a CMYK file that I can send to a printer. SOme pointers would be greatly appreciated...

This is not possible in Elements. You would need the full version of Photoshop to do this.
Colin.

Error while trying to export with Preview: 'unable to convert NSNamedColorSpace System controlColor to Device RGB colorspace'

When I try to export a PDF with preview, the dialog doesn't show and this error appears in the system log.
11/2/13 2:01:01.684 PM Preview[828]: -[NSRemoteView viewDidMoveToWindow] caught non-fatal NSInternalInconsistencyException 'unable to convert NSNamedColorSpace System controlColor to Device RGB colorspace' with backtrace (
          0   CoreFoundation                      0x00007fff8e24d41c __exceptionPreprocess + 172
          1   libobjc.A.dylib                     0x00007fff8a400e75 objc_exception_throw + 43
          2   CoreFoundation                      0x00007fff8e24d1f8 +[NSException raise:format:arguments:] + 104
          3   Foundation                          0x00007fff8be42c61 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 189
          4   ViewBridge                          0x00007fff8a08165c -[NSSecureColor initWithColor:] + 724
          5   ViewBridge                          0x00007fff8a08136f +[NSSecureColor secureColorWithColor:] + 48
          6   ViewBridge                          0x00007fff8a0a4cfb -[NSRemoteView sendFontSmoothingBackgroundColorToService:] + 40
          7   ViewBridge                          0x00007fff8a0a5bf5 -[NSRemoteView viewDidMoveToWindow] + 197
          8   AppKit                              0x00007fff881461d0 -[NSView _setWindow:] + 2899
          9   AppKit                              0x00007fff88143804 -[NSView addSubview:] + 364
          10 AppKit                              0x00007fff88157953 -[NSFrameView addSubview:] + 45
          11 AppKit                              0x00007fff88165cb5 -[NSWindow setContentView:] + 511
          12 AppKit                              0x00007fff889cb233 -[NSVBSavePanel init] + 287
          13 AppKit                              0x00007fff8874d5b9 +[NSSavePanel newRemotePanel] + 309
          14 AppKit                              0x00007fff8874d675 +[NSSavePanel _crunchyRawUnbonedPanel] + 120
          15 AppKit                              0x00007fff885a54fc -[NSDocument _preparedSavePanelForOperation:] + 260
          16 AppKit                              0x00007fff885a5f6f __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke_2 + 320
          17 AppKit                              0x00007fff885d5910 -[NSDocument _commitEditingThenContinue:] + 501
          18 AppKit                              0x00007fff885d5abd -[NSDocument _commitEditingWithDelegate:didSomethingSelector:contextInfo:thenContinue:] + 138
          19 AppKit                              0x00007fff885a5e20 __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke + 375
          20 AppKit                              0x00007fff885989b8 -[NSDocument _processActivity:blockingMainThread:] + 1373
          21 AppKit                              0x00007fff88599921 -[NSDocument performActivityWithSynchronousWaiting:usingBlock:cancellationHandler:] + 220
          22 AppKit                              0x00007fff885a5c9a -[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:] + 137
          23 Preview                             0x000000010392901b Preview + 917531
          24 AppKit                              0x00007fff8834d3d0 -[NSApplication sendAction:to:from:] + 327
          25 AppKit                              0x00007fff88368348 -[NSMenuItem _corePerformAction] + 394
          26 AppKit                              0x00007fff88368084 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 117
          27 AppKit                              0x00007fff883b74dd -[NSMenu _internalPerformActionForItemAtIndex:] + 35
          28 AppKit                              0x00007fff883b7359 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 104
          29 AppKit                              0x00007fff8835e176 NSSLMMenuEventHandler + 716
          30 HIToolbox                           0x00007fff8973c6d4 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 892
          31 HIToolbox                           0x00007fff8973bc87 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14H andlerCallRec + 385
          32 HIToolbox                           0x00007fff8974fd90 SendEventToEventTarget + 40
          33 HIToolbox                           0x00007fff89785a30 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueE ventRef + 420
          34 HIToolbox                           0x00007fff897b8618 SendMenuCommandWithContextAndModifiers + 59
          35 HIToolbox                           0x00007fff897b85c4 SendMenuItemSelectedEvent + 178
          36 HIToolbox                           0x00007fff897b84a5 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 94
          37 HIToolbox                           0x00007fff897c0425 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 718
          38 HIToolbox                           0x00007fff897c0051 _HandleMenuSelection2 + 446
          39 AppKit                              0x00007fff882d079c _NSHandleCarbonMenuEvent + 284
          40 AppKit                              0x00007fff8812f56e _DPSNextEvent + 2170
          41 AppKit                              0x00007fff8812e8db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122
          42 AppKit                              0x00007fff881229cc -[NSApplication run] + 553
          43 AppKit                              0x00007fff8810d803 NSApplicationMain + 940
          44 libdyld.dylib                       0x00007fff868025fd start + 1
          45 ???                                 0x0000000000000001 0x0 + 1
timestamp: 14:01:01.684 Saturday 02 November 2013
process/thread/queue: Preview (828) / 0x7fff741cc310 / com.apple.main-thread
code: line 607 of /SourceCache/ViewBridge/ViewBridge-46/ViewBridgeUtilities.m in logCaughtException
domain: exceptions

When I try to export a PDF with preview, the dialog doesn't show and this error appears in the system log.
11/2/13 2:01:01.684 PM Preview[828]: -[NSRemoteView viewDidMoveToWindow] caught non-fatal NSInternalInconsistencyException 'unable to convert NSNamedColorSpace System controlColor to Device RGB colorspace' with backtrace (
          0   CoreFoundation                      0x00007fff8e24d41c __exceptionPreprocess + 172
          1   libobjc.A.dylib                     0x00007fff8a400e75 objc_exception_throw + 43
          2   CoreFoundation                      0x00007fff8e24d1f8 +[NSException raise:format:arguments:] + 104
          3   Foundation                          0x00007fff8be42c61 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 189
          4   ViewBridge                          0x00007fff8a08165c -[NSSecureColor initWithColor:] + 724
          5   ViewBridge                          0x00007fff8a08136f +[NSSecureColor secureColorWithColor:] + 48
          6   ViewBridge                          0x00007fff8a0a4cfb -[NSRemoteView sendFontSmoothingBackgroundColorToService:] + 40
          7   ViewBridge                          0x00007fff8a0a5bf5 -[NSRemoteView viewDidMoveToWindow] + 197
          8   AppKit                              0x00007fff881461d0 -[NSView _setWindow:] + 2899
          9   AppKit                              0x00007fff88143804 -[NSView addSubview:] + 364
          10 AppKit                              0x00007fff88157953 -[NSFrameView addSubview:] + 45
          11 AppKit                              0x00007fff88165cb5 -[NSWindow setContentView:] + 511
          12 AppKit                              0x00007fff889cb233 -[NSVBSavePanel init] + 287
          13 AppKit                              0x00007fff8874d5b9 +[NSSavePanel newRemotePanel] + 309
          14 AppKit                              0x00007fff8874d675 +[NSSavePanel _crunchyRawUnbonedPanel] + 120
          15 AppKit                              0x00007fff885a54fc -[NSDocument _preparedSavePanelForOperation:] + 260
          16 AppKit                              0x00007fff885a5f6f __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke_2 + 320
          17 AppKit                              0x00007fff885d5910 -[NSDocument _commitEditingThenContinue:] + 501
          18 AppKit                              0x00007fff885d5abd -[NSDocument _commitEditingWithDelegate:didSomethingSelector:contextInfo:thenContinue:] + 138
          19 AppKit                              0x00007fff885a5e20 __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke + 375
          20 AppKit                              0x00007fff885989b8 -[NSDocument _processActivity:blockingMainThread:] + 1373
          21 AppKit                              0x00007fff88599921 -[NSDocument performActivityWithSynchronousWaiting:usingBlock:cancellationHandler:] + 220
          22 AppKit                              0x00007fff885a5c9a -[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:] + 137
          23 Preview                             0x000000010392901b Preview + 917531
          24 AppKit                              0x00007fff8834d3d0 -[NSApplication sendAction:to:from:] + 327
          25 AppKit                              0x00007fff88368348 -[NSMenuItem _corePerformAction] + 394
          26 AppKit                              0x00007fff88368084 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 117
          27 AppKit                              0x00007fff883b74dd -[NSMenu _internalPerformActionForItemAtIndex:] + 35
          28 AppKit                              0x00007fff883b7359 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 104
          29 AppKit                              0x00007fff8835e176 NSSLMMenuEventHandler + 716
          30 HIToolbox                           0x00007fff8973c6d4 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 892
          31 HIToolbox                           0x00007fff8973bc87 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14H andlerCallRec + 385
          32 HIToolbox                           0x00007fff8974fd90 SendEventToEventTarget + 40
          33 HIToolbox                           0x00007fff89785a30 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueE ventRef + 420
          34 HIToolbox                           0x00007fff897b8618 SendMenuCommandWithContextAndModifiers + 59
          35 HIToolbox                           0x00007fff897b85c4 SendMenuItemSelectedEvent + 178
          36 HIToolbox                           0x00007fff897b84a5 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 94
          37 HIToolbox                           0x00007fff897c0425 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 718
          38 HIToolbox                           0x00007fff897c0051 _HandleMenuSelection2 + 446
          39 AppKit                              0x00007fff882d079c _NSHandleCarbonMenuEvent + 284
          40 AppKit                              0x00007fff8812f56e _DPSNextEvent + 2170
          41 AppKit                              0x00007fff8812e8db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122
          42 AppKit                              0x00007fff881229cc -[NSApplication run] + 553
          43 AppKit                              0x00007fff8810d803 NSApplicationMain + 940
          44 libdyld.dylib                       0x00007fff868025fd start + 1
          45 ???                                 0x0000000000000001 0x0 + 1
timestamp: 14:01:01.684 Saturday 02 November 2013
process/thread/queue: Preview (828) / 0x7fff741cc310 / com.apple.main-thread
code: line 607 of /SourceCache/ViewBridge/ViewBridge-46/ViewBridgeUtilities.m in logCaughtException
domain: exceptions

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 can i convert my file from RGB to CMYK?

I need to convert my pages project from RGB to CMYK. How can I do this?

Which version of Pages and can you be more specific about what file you have and what you are intending to do with it?
Peter

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

Redistilling PDF some pages have been converted from cmyk to rgb.

When re-distilling a pdf on certain files, some pages convert to rgb, even though the setting "High Quality Print" in Acrobat is set up leave colours unchanged.
Same problem occurs on Acobat X, 9, 8 versions.
Any help or suggestions appreciated.

Do you re-print them to Adobe PDF printer using Acrobat or use distiller for this.
In Acrobat once you select Adobe PDF printer click on Advanced option. Click on Color Management. Select -> Same As Source under Color Handling drop down. Having selected "Leave colours unchanged" and Same As Source will not make any change.
I believe it will work for you.
~SaVe

Can't convert from CMYK to RGB in Illustrator CS6

I'm moving art over to a new document. It was created in CMYK. The new document has a color mode of Basic RGB. After pasting the art I select it all, and choose Edit | Edit Colors | Convert to RGB. After saving and re-opening the document, the art once again has CMYK attributes, not RGB. What am I doing wrong?

That might be it, Jacob.
It's when, for instance, I have the Appearance window open and shift-click on the stroke or fill to see the color attibutes (rather than simply looking at the swatches). It kept showing up in CMYK.
But making that change in the flyout seems to have it showing properly.
Thanks!

How to keep color when switching from RGB to Indexed Color Mode?

I'm working in Photoshop CS6
In Photoshop I've designed a custom crop screen for use in Magic Lantern (a program that runs with Canon cameras) The project is in 8bit RGB and to be able to use it (in Magic Lantern) I have to change it to Indexed Color (using a an .act file provided fom them) Then I have to save it as a .bmp. When I chnage from RGB to Indexed color (loading the .act file) the color in my Photoshop project turns to grey.
I haven't worked with Indexed colors or changing the color mode etc.
My question is... how can I keep the color (or a color similar, compatible color) to what I created in RGB when I convert it to Indexed Color using the .act file?
Any suggestions?
Thanks

Attached are 4 jpgs:
- The Crop Screen as it appears in the PSD file (RGB color/8-bit)
- The Index Color .act file that I'm loading
- The settings after I have loaded the act file
- the Crop Screen with the blue color missing

Converting from RGB colorSpace to cs_gray

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