I do my industrial design sketching in blue colored pencil and am building a sketchbook page in my portfolio. I want these sketches to have a perfect white background but I'm finding any solutions. Does anyone know a method?
Could you post a sample picture?
There are a lot of ways, most likely even something a way you can automate.
In this case showing a sample picture will give you a more accurate answer from the community.
In any case, it is most likely you will find your answer in this menu:
My gut feeling tells me you're going to want to use Auto Tone first, then a Levels with appropriate settings, and then perhaps a Posterize to finish with.
This is likely to be recordable in an Action (do you know what that is?) and then you can just repeat it every time you wish to upload a sketch.
Blue dykem. ❤️
A screenshot of your workspace and image would be helpful. Are you saying that the background does not appear to be perfectly white on your monitor? If that is the case, then use the Colour Sampler tool to measure the actual colour. The numbers never lie, and could indicate that the background is already fully white, but not appearing so on your screen.
In the example below, sample points #2 and #8 are slightly off white, but the rest are all fully white.
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Or use background removal techniques to strip the entire background -- denoted by a checkerboard pattern.