Inspiring

Answered

Is there a way to turn negative values 32 bit image into normalized 0-1 one in Photoshop?

Forum|Forum|3 years ago
July 10, 2022
5 replies
4623 views

Automatically I mean , and then make a script that do it by single click. My guess i could do it with a use of flat fill effect adding some positive value then levels maybe. But I'd like a quick universal solution whatever values are in original image.

Actions and scripting

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Correct answer davescm

I just checked and you can remap -x to +x to a normalised 0 to 1, either by channel or overall, very simply in Adobe 3D Designer using levels nodes.

'By channel' shown below with the levels settings for the blue channel shown.

Dave

davescm

Community Expert

Hi

To remap the 32 bit values values from negative to all positive between 0 and 1 , you can use a colour fill layer set to Linear Dodge (Add) to bring all values positive then a second set to Divide to restrict the positive range. There is no automatic adjustment for that.

As an aside, comparing Photoshop to Nuke is a bit 'apples and pears', as they were designed for differing purposes and while the full version of Photoshop costs £9.99 /month, Nuke starts at £399/year for the cut down Indie version.

Dave

K

kirkr5689Author

Inspiring

Divide to what, could you elaborate that part please?

yeah, Nuke is cool but too expensive . It's exactly a reason I try to use Phootoshop. After all I need just to composite a single frame , a static image and Photoshop became quite flexible with all its groups clipping , linked smart objects and scripts . So perhaps it can do something more advanced too beyond just photo tweaks . I also love its simple ICC color managment vs all that ACES pain in your ....

davescm

Community Expert

The divide blend mode will divide the pixel values on the lower layer by those on the top. So if you set all the pixels on the upper layer to the maximum value on the lower layer then the result will be normalised 0 to 1.

What size is the image i.e. pixel dimensions? Processing it via Adobe Substance Designer's pixel processor may be a better way as you could then build a control function to do what you want to each pixel.

Dave

Jeff Arola

Community Expert

Have a look at Filter>3D>Generate Normal Map

K

kirkr5689Author

Inspiring

How can it be related ? It was most useless thing ever existed in Photoshop. To create low quality blurry normal maps nobody used

K

kirkr5689Author

Inspiring

I have posted the exmple : https://community.adobe.com/t5/photoshop-ecosystem-discussions/is-there-a-way-to-turn-negative-values-32-bit-image-into-normalized-0-1-one-in-photoshop/td-p/13059792?attachment-id=115295

it's a position render of a biug and small spheres. B channel is depth . it's all in negative value space aroud -40 . I am looking for an automated way I could bring it to positive visiable 0-1 space to make a 16 bit integer image. Make an action of it and execute whenever I need . So I could use it with any kind of CG image of any depth easily. To make a FOV effect or put a mist , smoke render etc to a scene rendered picture. Or to make an edge mask through hipass to paint on worn edges . Whatever 2d compostors like Nuke do for movies , just in a single picture and using just Photoshop.

J

jazz-y

Legend

You can use the "calculate" or "apply image" commands to modify the channel's pixels. It works, but I'm not sure if you can get perfect accuracy.

In Photoshop, the ability to work with image pixels through scripts is extremely limited.

I think you should look for another way to solve this problem.

R

r-bin

Legend

In Photoshop, the ability to work with image pixels through scripts is extremely limited.

I think you should look for another way to solve this problem.

By @jazz-y

Save as photoshop raw. Open the file with a script. Change the data as needed. Open the modified raw file. Bingo!

Abambo

Community Expert

Show an example. Where do the “negative values 32 bit image” come from?

Negative 32 bit (integer) values range from -1 to -2,147,483,648, so -1 may be 0 and -2,147,483,648 may represent 1 and any value in between may represent any fraction of value between 0 and 1 (or vice versa). But you need scripting to do that.

ABAMBO | Hard- and Software Engineer | Photographer

K

kirkr5689Author

Inspiring

Here is example. look at blue channel. it's all black becaouse pixel values are all in betwwen -1 and -2 something. and red and green values is in between 1 and -1 . Can photoshop turn it into normalized 0-1 visiable range somehow?

position.zip

Abambo

Community Expert

I still don't understand.

Photoshop represents on screen what is in the image channels. I don't know the source of your image, but it there should some information in that channel, you probably need to write a program that reads this channels and transforms the data accordingly. For Photoshop, this is a picture with no blue channel content, and therefore it's all black. That stays all black, independent of any operation you apply.

If I understand well, the 32 bits colour mode is only used for HDR images and Photoshop is ill-equipped to work with those images.

ABAMBO | Hard- and Software Engineer | Photographer

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