How to remove grey of the scanned image?

I have about a dozen large .tiff files, which are scans of large b & maps in vector w - on top of which people have attracted multicolored markers.

I want to end up with images that are ONLY lines of color. In other words, I want the 'gray' plan to disappear.

I'm not advanced in Photoshop and I'm a bit overwhelmed by all the different tools for color management. The research is nothing quite like what I got. I followed several help articles on the selection of ranges of colours, hue/sat adjustment, etc., but I have the impression there is something I don't get.

Grateful also for suggestions on the entire process. The .tiffs are MUCH bigger that I need (100-150 megabytes). Should I low scale them? Convert to PNG or another format?

My desired final product is a bright and clear these lines of color chart. I could turn them into an animated gif by separating the colors in layers, but I could also hold of print quality of single images.

Thanks for any advice, of "this is how I did exactly what ' 'go read what you missed of course.'

If this is the result you are looking for:

1. open the file, and then choose Image > Mode > Lab color

2 Cmd + J to create a duplicate layer

3. choose the channels and then choose the lightness channel

4. choose the editing command > fill and fill with white

5. click on the lab channel, then back to layers

6. image > Mode > RGB color

7 Cmd + J to create a duplicate layer and change its blending Mode to multiply

8. Repeat steps 7-intensity colours

If the gray starts to appear, choose curves and move slowly at the end of the point culminating the curve on the side to remove the gray.

Tags: Photoshop

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