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Display 7 bits images in pattern sequence

Cheung Ka Yan
Prodigy 225 points

Hi all

In the Dlp doc, it mentions it is able to display a 6,7bits image

However, i have viewed a post here which mention it only supports uploading 1, 4, 8 image.

http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/850/t/164199.aspx

if i want to display a 7 bits image,  what should we do?

upload a 8 bit image then display it in 7 bits

please advice

  • 0
    TI__Prodigy 410 points

    Hi Cheung Ka Yan,

    The BMP file format only supports 1, 4 and 8 bit index per pixel. So the input image has to be any one of them.

    However the pattern display can be 1, 2, 3, 4, 5, 6, 7 or 8 bit depth.

    As you have guessed correctly you can use 8 bit indexed BMP image to display 7 bit depth pattern, make sure it uses only the indices 0 to 127.

  • 0 in reply to Sureshkumar Manimuthu
    Prodigy 225 points

    Thank for your reply

    One more question i want to ask

    I have done an experiment about the bit depth.

    I uploaded one 8 bits  image which have  7colors ( Greylevel : 0, 128, 64, 32, 16, 8, 255)

    When i set 8 bits ,  i saw 7 different color.

    When i set 7bits into Dlp, i still saw 7 colors.

    For my understanding, i should see 6 colors

    because the dlp displays  greylevel 128 and 0 as black color,

    it should treat greylevel 128 as bitwise 1000 000 and ignore the most

    signicant bit. 000 0000 should be present black color.

    Please give me some advice.

  • 0 in reply to Cheung Ka Yan
    TI__Prodigy 410 points

    Hi Cheung Ka Yan,

    When you say your image has 7 colors, are you referring to the palette entries?

    The LightCrafter only uses the color index for patterns display, so make sure that your indices are 7 bit wide.

    If you can attach the BMP, it will help.