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Removing unwanted color, make just b & w

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Removing unwanted color, make just b & w
carljong Offline
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#1
02-03-2022, 11:19 AM
Is there an easy way to make a photo of sheet music just black and white?  I've been working on pages, using Color > Curves and this one turned out with yellow.  I've tried a few suggestions on the internet, but no luck.  Seems it should be simple.

I tried attaching my photo but keep getting an error.

Thanks
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rich2005 Offline
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#2
02-03-2022, 11:28 AM
Is the image too large to attach ? png / jpeg /..etc have a 500 kb limit .xcf 2 MB

If too large, either crop down to a smaller representative size (less than forum limits) or post on an external site such as imgur.com or https://postimages.org or https://imgbb.com
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EwertonMoreira Offline
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#3
02-03-2022, 01:18 PM
Can you change the image mode to Grayscale? Then use Colors -> Levels?
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programmer_ceds Offline
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#4
02-03-2022, 05:08 PM
The Threshold tool might give you usable results.
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Krikor Offline
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#5
02-03-2022, 05:21 PM
(02-03-2022, 11:19 AM)carljong Wrote: Is there an easy way to make a photo of sheet music just black and white?  I've been working on pages, using Color > Curves and this one turned out with yellow.  I've tried a few suggestions on the internet, but no luck.  Seems it should be simple.

I tried attaching my photo but keep getting an error.

Thanks

I believe the tips from posts #2 and #3 at https://www.gimp-forum.net/Thread-removi...rom-a-scan could be useful to you.
                               .....
Samj Portable - Gimp 2.10.28 - Win-10 /64.
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Ofnuts Offline
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#6
02-03-2022, 05:34 PM
(02-03-2022, 11:19 AM)carljong Wrote: Is there an easy way to make a photo of sheet music just black and white?  I've been working on pages, using Color > Curves and this one turned out with yellow.  I've tried a few suggestions on the internet, but no luck.  Seems it should be simple.

I tried attaching my photo but keep getting an error.

Thanks

You get a color shift because a color saturates before the others. You can convert the image to B&W using Colors ➤ Desaturate. Changing the image mode to grayscale is another way but it has implications...
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carljong Offline
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#7
02-03-2022, 10:32 PM
(02-03-2022, 05:34 PM)Ofnuts Wrote:
(02-03-2022, 11:19 AM)carljong Wrote: Is there an easy way to make a photo of sheet music just black and white?  I've been working on pages, using Color > Curves and this one turned out with yellow.  I've tried a few suggestions on the internet, but no luck.  Seems it should be simple.

I tried attaching my photo but keep getting an error.

Thanks

You get a color shift because a color saturates before the others. You can convert the image to B&W using Colors ➤ Desaturate. Changing the image mode to grayscale is another way but it has implications...

Colors > Desaturate did the trick. Thanks
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