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Thread: IrfanView shows 8 BPP but it should be 1 BPP

  1. #1

    Default IrfanView shows 8 BPP but it should be 1 BPP

    This bug is about Wireless Bitmaps (WBMP) in IrfanView.

    I'm playing around with WBMP just for the fun and learning the history of computer graphics.

    I was reading at the oldschool WAP specification, and learned that a WBMP image file uses 1 BPP.
    Please read it over here: http://openmobilealliance.org/tech/a...20010515-a.pdf on page 11.

    The specification is saying:
    WBMP type 0 has the following characteristics:•No compression•Colour: one bit represents a pixel (white=1, black=0). •Depth: 1 bit deep (monochrome) •The high bit of each byte is the left-most pixel of the byte.•The first row in the data is the upper row of the image.

    Then I was looking for a test WBMP file to see how IrfanView displays it. I found one on this webpage:
    http://fileformats.archiveteam.org/wiki/WBMP the direct link to the WBMP image is: https://telparia.com/fileFormatSamples/image/test.wbmp

    When I open it in Irfanview 4.54 - 64 Bit it says at the bottom:
    800 x 600 x 8 BPP.

    Click image for larger version. 

Name:	wbmp.jpg 
Views:	36 
Size:	427.7 KB 
ID:	5910

    When I open the Image properties, IrfanView shows: 256 (8 BitsPerPixel) at the Original colors.

    Now, I want to talk about the 8 BPP, because it contradicts the specification.
    The question I have is: is IrfanView showing the wrong BPP or is it something else ??


    Kind regards,
    Last edited by julekker; 27.07.2020 at 05:15 AM.

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