Changing one colour to another throughout entire image

[RMS1]

Hello,
This is a follow-up to my posting yesterday, about reducing ageing colouring in an old comic book I scanned in greyscale.
I have taken the advice to scan the images in colour. The ageing process has turned white into various shades of brown, but the artwork and text is in black only.
How do I change all the shades of brown throughout the image to white? Will any black areas with age browning on them, which can't be seen at normal magification, also turn white?
The attached image showing the ageing has been reduced in size for this posting.
Thanks.

[Kathy_9]

With PSP there is usually more than one way to do something. One quick way is to use White Balance.

click for larger view

[CHoffman]

Very true about multiple ways to do things. Per the previous thread, the point of scanning in color is to take advantage of the built in filtering that creates a color image. Take your color image and split to RGB, using image/split channel/split to RGB. You'll then have four images on the screen, the original, red1, green1 and blue1. In this case, keep red1 and close the rest. You can then clean up the margins if desired and improve the contrast and brightness. I usually do the latter using histogram adjust, changing compress/expand and gamma.

red channel

comic red channel.jpg (39.5 KiB) Viewed 1865 times

[Jean-Luc]

Insert a white raster layer under the image's layer.
Use the Suz's Shook RemoveAnyColor script to remove the brownish color (settings : R247 G223 B175 Tolerance 50 Softness 30)
Apply an Histogram adjustement (Ctrl+Shift+H). Settings : Low 50, Gamma 0,60.

Here the result.
Values need adjustment because your sample image is tiny and my settings may be not precise enough.

Action layers.png (34.18 KiB) Viewed 1856 times

ss-RemoveAnyColor-00.zip

(760 Bytes) Downloaded 119 times

[RMS1]

Wow! Excuse my naivete, but what great ideas and results! I am making notes of all this.
While I am here, can I ask a small off-topic question? I've looked through the manual, and tried googling search terms, and haven't seen an answer. If I am using Erase or Paint Brush, how can I make a change by sweeping the mouse either true vertically or true horizontally in a straight line? I'd thought the Shift, Ctrl or Alt key would be used with the mouse, but they seem to be for other purposes.
Thanks,
Roger

[Jean-Luc]

how can I make a change by sweeping the mouse either true vertically or true horizontally in a straight line?
Roger

In vector mode, Shift permits to draw a straight line horizontal or vertical.
In raster mode (Erase or Paintbrush), it doesn't work.
You need to do it with :
View / check Rulers, check Guides and check Snap to Guides
Place a guide where you want to draw your line.
Draw on the guide.

[MarkZ]

how can I make a change by sweeping the mouse either true vertically or true horizontally in a straight line?
Roger

In vector mode, Shift permits to draw a straight line horizontal or vertical.
In raster mode (Erase or Paintbrush), it doesn't work.
You need to do it with :
View / check Rulers, check Guides and check Snap to Guides
Place a guide where you want to draw your line.
Draw on the guide.

If I may add to Jean-Luc's comment; in raster mode and using paintbrush and the guide, click on the guide for the starting point. Go to another point on the guide, press shift and click on the guide. Paintbrush will draw a straight line between the points. This applies to other tools such as eraser.

[RMS1]

Thanks for the replies on the off-topic question about painting or erasing in vertical and horizontal lines - have made notes. Appeciated.
- Roger