[General] Color does not match scalar data

valdemar · August 16, 2016, 07:45

Hi.

I do simulations on objects from images. I would like to put my simulation "back on an image". Such that the scalar values from the simulation (range 0-255 - could be decimals) correspond to the pixel value in the final animation.

The screenshot illustrates my problem. At the point where I have a scalar value 222 (see the cursor) the RGB colours are (174,171,165) (see window upper right corner), where I expected it to be approximately (222,222,222). (With the shown setting the pixel value seems always to be 25% lower than the scalar value)

I've tried to play with the opacity, lighting, different colours (like only one color channel), other presets and so one. But I cannot find a correct setting for this.

Do anyone have any ideas on how to do this?

Thank you.
Screenshot.jpg

EDIT:
It seems like it is the opportunity to adjust the lighting, that kind of decrease the colour range from 0-255 to a smaller range, which only spans a range of size approx. 200. Do anyone know how to deactivate the lighting/specular?

Kopfgeburt · April 1, 2021, 13:43

Hello Christian,

in case this is still relevant for anyone. Paraview adds a light effect for 3D objects, this changes the brightness of some areas. You can turn it off by opening View > Light Inspector and unticking the box Light Kit.

August 16, 2016, 07:45	Color does not match scalar data	#1
valdemar New Member Christian Valdemar Hansen Join Date: Aug 2016 Posts: 1 Rep Power: 0	Hi. I do simulations on objects from images. I would like to put my simulation "back on an image". Such that the scalar values from the simulation (range 0-255 - could be decimals) correspond to the pixel value in the final animation. The screenshot illustrates my problem. At the point where I have a scalar value 222 (see the cursor) the RGB colours are (174,171,165) (see window upper right corner), where I expected it to be approximately (222,222,222). (With the shown setting the pixel value seems always to be 25% lower than the scalar value) I've tried to play with the opacity, lighting, different colours (like only one color channel), other presets and so one. But I cannot find a correct setting for this. Do anyone have any ideas on how to do this? Thank you. Screenshot.jpg EDIT: It seems like it is the opportunity to adjust the lighting, that kind of decrease the colour range from 0-255 to a smaller range, which only spans a range of size approx. 200. Do anyone know how to deactivate the lighting/specular?

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April 1, 2021, 13:43		#2
Kopfgeburt New Member Johannes Schneider Join Date: Mar 2021 Posts: 3 Rep Power: 6	Hello Christian, in case this is still relevant for anyone. Paraview adds a light effect for 3D objects, this changes the brightness of some areas. You can turn it off by opening View > Light Inspector and unticking the box Light Kit.