brightness offset

[Joep Swagemakers]

Hi Joost,

I'm using PTgui to stitch the scans that I make. I create a coordination file so all scanned areas are in the right position, even when the scanned subject is homogeneous. I then use the batch builder to load the different maps that my scanner creates on the same positions and build the "panorama". This works great for the color map but when I get to the normal map PTgui skews the brightness of the images a bit resulting in seams in between the images. This is not the case when I stitch them together in photoshop myself. You can see this below. Presumeably this is because it takes the brightness values from the calibration scan and applies it on the normal map, but I'm not sure what is happening. Is it possible to prevent PTgui from applying any brightness changes to the images? 



Please let me, thanks!

-Joep Swagemakers

[Joep Swagemakers]

This is the version I have when stitching in photoshop, no seams or brightness change at all visible in the source files.

[Erik Krause]

Am 28.01.26 um 10:24 schrieb Joep Swagemakers:

> This works great for the color map but when I get to the normal
> map PTgui skews the brightness of the images a bit resulting in seams in
> between the images.

Try to use the Multiband blender (Panorama Editor, Blending side menu).
Also play with the other Blending settings. If this doesn't work out,
please make a set of images available for download. Use wetransfer,
dropbox or similar and post the link here.

I'm curious: What are those images anyway?

--
Erik Krause

[Joep Swagemakers]

Thanks a lot! I was looking for those menus but couldn't remember where I saw those. Setting the blending to Don't Blend dit the trick. 

You are looking at a normal map of piece or carbet that has been scanned using the photometric stereo technique. Its a fairly common way to scan textures, I'm using this for a client.

Thanks again for your help, very happy this works.