Coloured lines on a greyscale image

[clairep96840457]

Hi, I have an image which is greyscale and I need to overlay coloured lines on it – I can't remember how to do this, do I use my channels? Help appreciated. Thanks.

[Lumigraphics]

You'll have to convert the Mode to color.

[c.pfaffenbichler]

If you need the image to print in K only you could to copy the Channel, convert the image to CMYK, fill C, M and Y with white and paste the image into K. 

The add Shape Layers for the lines. 

[clairep96840457]

Thanks for this – I do remember that this is how I've done similar previously. Just have to nail the lines now!

[josephlavine]

You'll need to change your mode from greyscale to either RGB or CMYK depending on your needs. 

warmly/j

[CShubert]

Hi,

I could be a simple as this, switch from Grayscale to RGB Color, then your color layers will show as color.

[c.pfaffenbichler]

Technically one could also add Spot Channels to a Grayscale image but that would only approach making sense if one actually prints with Spot Colors … 

And depending on the output needs and the linework’s complexity it might make sense to create it in a vector ariented application like Illustrator or Indesign. 

[clairep96840457]

Thanks everyone for your help 🙂

[CShubert]

Hi, was there a solution to your question? Just making sure you found your answer.

thank you,

[Earth Oliver]

i'm guessing they were asking about adding guides...

[clairep96840457]

Hi there, thank you yes I found my solution. I should have explained myself more clearly – having 80 odd radiography pics, it's quicker to batch them altogether into greyscale and size. The odd one has colour lines (not guides) to denote something or another on the radiograph, which is then trickier to do having turned the image to greyscale; however, if you keep the image as RGB or CMYK it has a different hue to straight greyscale – hence my question.

All the answers were not wrong and were helpful and am very greatful for all assistance. I remembered using channels and printing only on the black plate previously, but as I couldn't then work out how to add the coloured lines plus I couldn't find anything on google, I opted to use Illustrator.

Great forum, thank you 🙂

[Earth Oliver]

Are you asking about adding guides?
View>Rulers, then click and drag from the ruler.

[clairep96840457]

No, but thank you for your help.