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I use an image with black letters and white background as the texture on a plane.

enter image description here

But the contrast after rendering is very bad. How can I increase the contrast? Or is it possible withput external light source to make the white part of the texture gloom?

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2 Answers 2

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It could be because of the Color Management, in the Render setting. You have to change it from "Filmic" to "Standard".

Filmic : enter image description here

Standard : enter image description here

By default Blender uses the "Filmic" color management, which handles better colors with high values of light. When working with "true colors" (ex : for a 2D project with precise HEX values), you have to set the color management to "Standard".

If you want to know more, Chris Brejon got you covered : https://chrisbrejon.com/cg-cinematography/chapter-1-color-management/

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Maybe your lighting is not strong enough and you need to add a light. Or you can use an Emission node instead of a Diffuse, or if you use a Principled BSDF, plug your image into the Emission input, and play with the Emission Strngth value: at a rate of 1 you'll see the text as it is and you won't need any light. At a higher rate the material will get brighter and the text will tend to fade out.

enter image description here

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