convert photo to black & white

T
Posted By
Tim923
Aug 4, 2006
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523
Replies
11
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Closed
I scanned a black and white photo in color. There are some stains on the photo that appear in color. How do I convert the bitmap file to black and white (so the stains appear as black and white also)?
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black black and white conversion white

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R
rose
Aug 4, 2006
Tim923 wrote:
I scanned a black and white photo in color. There are some stains on the photo that appear in color. How do I convert the bitmap file to black and white (so the stains appear as black and white also)?
K
KatWoman
Aug 4, 2006
"Tim923" wrote in message
I scanned a black and white photo in color. There are some stains on the photo that appear in color. How do I convert the bitmap file to black and white (so the stains appear as black and white also)?

I never work in bmp format
if the adjustment layers or other menus are not showing
try changing the image mode to rgb first
the use image desaturate or adjustment layer Hue/Sat and move center slider left

if you plan to remove the stain having it in color is easier to remove by the channel method
MR
Mike Russell
Aug 4, 2006
Tim923" wrote in message
I scanned a black and white photo in color. There are some stains on the photo that appear in color. How do I convert the bitmap file to black and white (so the stains appear as black and white also)?

If you make the image available, and can give permission for me to use it, I’d like to consider using it for a tutorial I’m writing. —

Mike Russell
www.curvemeister.com/forum/
T
Tim923
Aug 4, 2006
On Fri, 04 Aug 2006 19:11:36 GMT, "Mike Russell"
If you make the image available, and can give permission for me to use it, I’d like to consider using it for a tutorial I’m writing.

Sure, go ahead.

It’s my 1st grade class photo:
http://www.geocities.com/tim_schmits/eschool/1.html

Some orange stains on the B&W photo. The photo on the website is a JPEG. I also have the original TIFF scan. So it wasn’t actually a BMP file.

I was thinking about leaving the stains in there, but converting the photo to B&W to keep it all uniform.
BV
Bart van der Wolf
Aug 5, 2006
"Tim923" wrote in message
SNIP
I was thinking about leaving the stains in there, but converting the photo to B&W to keep it all uniform.

Wy keep the stains?
Try using a Photoshop Channel mixer function, or lose the Red channel data, or a similar method in other software.

—
Bart
MR
Mike Russell
Aug 5, 2006
"Tim923" wrote in message
….
I was thinking about leaving the stains in there, but converting the photo to B&W to keep it all uniform.

http://www.geocities.com/tim_schmits/eschool/1.html

Hi Tim,

That works pretty well, since it’s a black and white image in the first place. Another good solution is to simply use the red channel, which is free of stain.

There is more detail in the shadows in the green and blue channels, so here is a third method that removes the red stains while keeping the shadow detail.

Duplicate the image to a new layer, and use Image>Adjust>Channel Mixer to set all three channels of that layer to 100 percent red. This gives you a clean image, with noisy shadows. Then convert to Lab mode, double click the top layer, and use the "Blend If" sliders to replace only the red stained area. This is done by moving the black triangle for the "Underlying Layer" slider to a value of 132.

The scan has an overall blue color cast, as well as a slight remaining yellow stain just above the teacher’s head. To fix these two problems, add an adjustment layer, with saturation set to -100 to make the image black and white.

If necessary, the yellow stain can be removed using the same technique as for the red stain, just with the players shifted around a bit. Use the "Blend If" b channel instead of the a channel.

If you’d like the psd file with the above adjustments as layers, send me an email. Mike at curvemeister.com. I won’t be making this one into a tutorial, since for that I need an image that is damaged in all three channels, and yours has an intact red channel.
—
Mike Russell
www.curvemeister.com/forum/
MR
Mike Russell
Aug 5, 2006
In my last post, " This is done by moving the black triangle for the "Underlying Layer"
slider to a value of 132." refers to the Blend If slider for the a channel. —

Mike Russell
www.curvemeister.com/forum/
D
Dave
Aug 5, 2006
Why does people sometimes convert colored photos to black & white? Or is it the same kind of people investing in antique cars; the model T Ford drivers? The one-wheel bicycle riders – (those with the big rear wheel?)

Dave
K
KatWoman
Aug 5, 2006
"Dave" wrote in message
Why does people sometimes convert colored photos to black & white? Or is it the same kind of people investing in antique cars; the model T Ford drivers? The one-wheel bicycle riders – (those with the big rear wheel?)

Dave

put down the weed
step away from the bong

did you read the OP?
it is already a BW image
he wants the red stains turn to BW

and some helpful contributors like Mike and Bart are helping him remove them instead
R
Roberto
Aug 6, 2006
Because color isn’t always the best way to give a photo impact. There are images that look better black and white than they do in color.

R

"Dave" wrote in message
Why does people sometimes convert colored photos to black & white? Or is it the same kind of people investing in antique cars; the model T Ford drivers? The one-wheel bicycle riders – (those with the big rear wheel?)

Dave
D
Dave
Aug 6, 2006
On Sat, 5 Aug 2006 21:16:48 -0700, "Hebee Jeebes" wrote:

Because color isn’t always the best way to give a photo impact. There are images that look better black and white than they do in color.
R

"Dave" wrote in message
Why does people sometimes convert colored photos to black & white? Or is it the same kind of people investing in antique cars; the model T Ford drivers? The one-wheel bicycle riders – (those with the big rear wheel?)

Dave

Thanx Heebee, quite sure more people waited for this answer:-)

Dave

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– 12 scenes

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