typescript 中 base64 pdf 的反色

Question

If I have a random pdf encoded to base64, is there any way I can programmatically switch its colors to the negative form? (Ex. white to black, red to blue, etc)

Answer 1

I think yes: using PdfJS you can draw the PDF to a canvas, it's not to hard. then with the canvas you can invert the colors, but you will have an image as a result and not a PDF. You can show that image in your HTML or download it.