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Asked: 2026-06-08T15:28:03+00:00

This is a comprehension question. When I have an jpeg image (A4, 96DPI, 24

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This is a comprehension question.

When I have an jpeg image (A4, 96DPI, 24 bits per pixel) which takes up 200KB at 90% quality level on the disk and I load it in WPF (e.g. with XAML).

<Image Source="MyJpeg.jpg"></Image>

WPF would have memory consumption for the image of not (only) 200KB but at least 8.27 x 11.69 X 96² X 24 / 8 / 1024 = 2610.26KB, right?

with:

Size of A4 =  8.27 inch  x 11.69 inch 
Pixels in the whole picture = [Size of A4] x 96²
Bits for the whole picture = [Pixels in the whole picture] x 24
Bytes for the whole picture = [Bits for the whole picture] / 8
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1 Answer

  1. Editorial Team

    The DPI is only useful when you want to know the physical size of your image on a physical display (screen, paper).

    Your jpg image has a width and a height, in pixels. When used as an image source, it will get converted to a bitmap, whose size will roughly be, in bits :

    width * height * bits per pixel

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