How does PDF BitsPerComponent translate into bits per pixel for images?

Question

My goal is to convert PDF to image (in particular, to TIFF).

There is a PDF property called BitsPerComponent

And as described on the page

This property can be 1, 2, 4, 8, or 16. Other values ​​are not supported in the PDF specification.

Does this mean that 1, 2, 4, 8, or 16 is converted to bit per pixel in images?

Answer 1

It sounds more like a beat on a color component, where the color component is one of (Alpha) / Red / Green / Blue or Gray. So take a bit by component and multiply by components by pixel to get a bit by pixel. For example, if you are talking about an RGB image, you have 3 components. RGB with 8 bits per component will be 8 * 3 = 24 bits per pixel of the image. If it's shades of gray, for example. one component, 8 bits per component will be 8 bits per pixel.

Answer 2

BitsPerPixel = 3 * BitsPerComponent if the color is saved as RGB

BitsPerPixel = 4 * BitsPerComponent if the color is saved as RGB with alpha (ARGB)

RGB is a random assumption ... this will be done for each color model using 3 components and may be an alpha channel. This will be BitsPerPixel = BitsPerComponent if it is a grayscale image.

Answer 3

No, it is converted to bits on a color channel. When you have an image in grayscale, it is essentially a bit per pixel.

If you have an RGB image with 16 bits per channel, you only have 48 bits per pixel (or even 64 if you have an alpha channel).

Answer 4

There are already many tools that can convert PDF files to images. If you want to write your own, you will need to study the huge specification and create a rasterizer. Why do you need to create your own solution?