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irishgrizzly
Apr 3, 2008, 04:14 AM
How do I set up a single spot colour in a grayscale image? Do I apply it in photoshop somehow or do I import the image to Illustrator as grayscale and apply it there somehow? Thanks



jerryrock
Apr 3, 2008, 03:11 PM
Convert the image from greyscale to RGB.

flrazor
Apr 3, 2008, 04:18 PM
How do I set up a single spot colour in a grayscale image? Do I apply it in photoshop somehow or do I import the image to Illustrator as grayscale and apply it there somehow? Thanks

Are you trying to make the entire image into that spot color, or does it need to be gray in places and spot in others?

irishgrizzly
Apr 3, 2008, 05:47 PM
Are you trying to make the entire image into that spot color, or does it need to be gray in places and spot in others?

It's going to a job that's only using to spot colours a spot blue for the logos and graphic elements, and a spot black for the text and photographs. The images need to be made of tints of a spot black.

andy.barron
Apr 3, 2008, 05:52 PM
Make the image cmyk & add alpha channels made as spot colours. Simply move elements to the spot channels as required.:)

killmoms
Apr 3, 2008, 05:53 PM
If the images are just going to be black, leave them grayscale. If you needed to integrate a spot color, you'd want to set up a spot channel in Photoshop. If you needed a black+spot image, a duotone would be your best bet.

flrazor
Apr 5, 2008, 03:05 PM
Agreed, if it's going to only print in black, then leave it as grayscale.

One other way to change the image to spot color if needed is to use the Duotone color mode and set the images as monotone with whatever spot color you need. You can manipulate the ink coverage (like the Curves scale) in there as well.

politburos85
Feb 23, 2009, 10:18 AM
I know this is a very late reply, but for future reference this is my preference for changing greyscale to a single spot colour, step-by-step...


open the greyscale image in photoshop

image > mode > multichannel

open the channel palette > you should have a single channel 'black' > highlight this then choose 'channel options' from the menu

click on the colour sqaure, choose 'colour libraries', choose the correct spot colour, in my case it's 'pantone cool grey 11'

click 'ok' change solidity to '100%'

click 'ok'

now save as a photoshop file, and now this can be imported into Indesign/quark etc.


you can fiddle around with the contrast, curves etc as you please.

deepred55
Apr 4, 2014, 05:14 AM
I know this is a very late reply, but for future reference this is my preference for changing greyscale to a single spot colour, step-by-step...


open the greyscale image in photoshop

image > mode > multichannel

open the channel palette > you should have a single channel 'black' > highlight this then choose 'channel options' from the menu

click on the colour sqaure, choose 'colour libraries', choose the correct spot colour, in my case it's 'pantone cool grey 11'

click 'ok' change solidity to '100%'

click 'ok'

now save as a photoshop file, and now this can be imported into Indesign/quark etc.


you can fiddle around with the contrast, curves etc as you please.

-----------------

I get the follow error msg when I try to import the psd file into Illustrator or Indesign "Unsupported colour mode or depth. Only RGB, CMYK, Grayscale, and Bitmap are supported".

However if I save as grayscale file in PS then import the file into Illustrator I can then apply a spot colour.

covisio
Apr 4, 2014, 06:11 AM
I know this is a very late reply, but for future reference this is my preference for changing greyscale to a single spot colour, step-by-step...


open the greyscale image in photoshop

image > mode > multichannel

open the channel palette > you should have a single channel 'black' > highlight this then choose 'channel options' from the menu

click on the colour sqaure, choose 'colour libraries', choose the correct spot colour, in my case it's 'pantone cool grey 11'

click 'ok' change solidity to '100%'

click 'ok'

now save as a photoshop file, and now this can be imported into Indesign/quark etc.


you can fiddle around with the contrast, curves etc as you please.
The above will work and is definitely the way to go if you're mixing spot colours and CMYK in the same (raster) image.
Plenty of print processes do demand this approach, for instance in packaging or securities printing.

If purely sticking to mono- or duo- or tri-tone, etc, then the monotone method works fine.

Open your grayscale image
Image>Mode>Duotone
Click on the swatch to choose your colour, if a Pantone then click the 'Color Libraries' button and you can key in a PMS ref.

Save the resulting file as a PSD format file

It can now be placed in an Illustrator or InDesign file. When you place it, it will automatically add the colour swatch chosen in the PSD file to your swatches in the AI or ID doc.

You can then output to PDF 1.4 or above, or separated PS if needed.

All methods mentioned are valid though (this one, the multichannel method, the additional channels on a CMYK, or placing the greyscale and applying a colour in AI) - except for the guy that suggested converting it to RGB :rolleyes:

Not sure why you're getting the error message.

covisio
Apr 4, 2014, 06:25 AM
Sorry, another, simplified way of doing it is to simply allocate one of your spare CMY channels to the spot colour, i.e. copy the content of your grayscale channel into the cyan channel of a CMYK image, leaving all other channels empty.
Then place this in the AI document, make everything that's intended to be blue>Cyan, everthing that's meant to be black>Black then output the file to PDF.
Then it's just a case of telling the printer to print everything that's Cyan>PMS Reflex Blue or whatever.
Okay, not very elegant and harder to preview/proof but it is a simple way to achieve this and makes a file that pretty much any printer can handle.

primalman
Apr 4, 2014, 04:40 PM
all of this is too complex. If you just want the image to be all one spot color in your layout, simply make it a grayscale or 1-bit, save as a PSD or TIFF, place in Illustrator, select the image container and select the spot ink swatch you desire. Done.

citizenzen
Apr 4, 2014, 08:37 PM
all of this is too complex. If you just want the image to be all one spot color in your layout, simply make it a grayscale or 1-bit, save as a PSD or TIFF, place in Illustrator, select the image container and select the spot ink swatch you desire. Done.

Agreed. Here is how it can be done in Indesign (my preferred program) ...

Both images grayscale.

Mask as needed.

Place in Indesign.

Assign spot color to image you want in spot color.

Multiply.

primalman
Apr 4, 2014, 09:19 PM
Agreed. Here is how it can be done in Indesign (my preferred program) ...

Both images grayscale.

Mask as needed.

Place in Indesign.

Assign spot color to image you want in spot color.

Multiply.

absolutely on the InDesign is preferred, much more appropriate place to do layout and for printing.

citizenzen
Apr 4, 2014, 11:00 PM
absolutely on the InDesign is preferred, much more appropriate place to do layout and for printing.

The only thing i use Illustrator for is editing vectors. Once that's done, then Copy/Paste into InDesign where 99% of my work is done.

eRondeau
Apr 6, 2014, 09:34 AM
It's actually quite easy to do in Preview, using Instant Alpha and/or Smart Lasso to isolate the element(s) you want to keep in color. Then copy them, reload the original photo and set it all to greyscale. Now paste the coloured elements and they'll appear seamlessly on top of the greyscale image. There are also any number of apps on the App Store that will do this effect for you easily.

citizenzen
Apr 6, 2014, 12:27 PM
It's actually quite easy to do in Preview, using Instant Alpha and/or Smart Lasso to isolate the element(s) you want to keep in color. Then copy them, reload the original photo and set it all to greyscale. Now paste the coloured elements and they'll appear seamlessly on top of the greyscale image. There are also any number of apps on the App Store that will do this effect for you easily.

I had no idea this could be done in Preview.

But can a Spot Color be applied?

Or is the colored part of the photo going to separate as CMYK?

This is a key part of the question.

primalman
Apr 6, 2014, 01:03 PM
It's actually quite easy to do in Preview, using Instant Alpha and/or Smart Lasso to isolate the element(s) you want to keep in color. Then copy them, reload the original photo and set it all to greyscale. Now paste the coloured elements and they'll appear seamlessly on top of the greyscale image. There are also any number of apps on the App Store that will do this effect for you easily.

Yeah. How does this achieve the spot color need as described in the original question?