Histogram Help

D
Posted By
drdavid32
Apr 1, 2004
Views
246
Replies
5
Status
Closed
In Photoshop CS I have 2 black & white images with differing histograms,

I want to take the histogram of image 1 and save it and then use that histogram and apply it to image 2.

So I end up with both images having the same histogram, can this be done? I have tried the curves control which sort of works but not as well as I had hoped, any ideas welcomed

DW
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J
jaSPAMc
Apr 1, 2004
On 1 Apr 2004 07:30:52 -0800, (Animal) found these
unused words floating about:

In Photoshop CS I have 2 black & white images with differing histograms,

I want to take the histogram of image 1 and save it and then use that histogram and apply it to image 2.

So I end up with both images having the same histogram, can this be done? I have tried the curves control which sort of works but not as well as I had hoped, any ideas welcomed
A histogram is a measurement of what IS in the image, not a setting.

You can approximate duplicating the range by noting three values in the first image. Using levels find the black level and the white level. Note the difference between 0 to black and 255 to white. Now get a feel for the position of the mid-tone slider vs the ‘curve’ of the histogram. It is above or below or on the central ‘hump’ and by how much.

Going to the second. You need to measure the spread between black and white. Take this vs the spread in image 1 and make a percentage. Take the image 1 to black value and appy the pecentage. Set the black slider that amount below the image 2 black level. If it’s below "0", then increase the output by the remaining amount.

Reverse for white.

Move the mid-tone to the same balance point vs the curve (not a ‘number’!). That’s about a close as you can get. Visually trim.
D
drjohnruss
Apr 1, 2004
asks:

I want to take the histogram of image 1 and save it and then use that histogram and apply it to image 2.

So I end up with both images having the same histogram, can this be done?

Why? Unless the two images are of the same thing, why should they have the same shape histogram? One thing you could do would be to appy histogram equalization to both of them. The histograms would then be the same. If the images "look" the same, I would be surprised.
UH
Ukko Heikkinen
Apr 1, 2004
Take a look at

http://www.panix.com/~jnr/

Ukko Heikkinen

Animal kirjoitti
viestiss
J
jaSPAMc
Apr 1, 2004
On Thu, 1 Apr 2004 20:56:24 +0300, "Ukko Heikkinen" found these unused words floating about:

Take a look at

http://www.panix.com/~jnr/

Ukko Heikkinen

Animal kirjoitti
viestissä:
In Photoshop CS I have 2 black & white images with differing histograms,

I want to take the histogram of image 1 and save it and then use that histogram and apply it to image 2.

So I end up with both images having the same histogram, can this be done? I have tried the curves control which sort of works but not as well as I had hoped, any ideas welcomed

DW
This looks verrrrrrrrry interesting!

I’ll have to play with it as I do a lot of panorama work.

TIA

JA
R
RicSeyler
Apr 2, 2004
Ahhhh I see now…. You mix adolesant Michael Jackson skin tone with adult Michael Jackson skin tone to achieve teenage Michael Jackson skin tone…

HAHAHAHAHAHA!!!!!

Ukko Heikkinen wrote:

Take a look at

http://www.panix.com/~jnr/

Ukko Heikkinen

Animal kirjoitti
viestissä:

In Photoshop CS I have 2 black & white images with differing histograms,

I want to take the histogram of image 1 and save it and then use that histogram and apply it to image 2.

So I end up with both images having the same histogram, can this be done? I have tried the curves control which sort of works but not as well as I had hoped, any ideas welcomed

DW

—
Ric Seyler

—

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