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pwgtoraster has small black dots. #20

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tianmax opened this issue Mar 18, 2023 · 3 comments
Closed

pwgtoraster has small black dots. #20

tianmax opened this issue Mar 18, 2023 · 3 comments

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@tianmax
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tianmax commented Mar 18, 2023

  1. When I run this command:
    ./pwgtoraster 1 user Test 1 "print-color-mode=Black printer-resolution=600x600dpi" windows-testpage.raster > 1.raster
  2. And run command:
    rasterview 1.raster
    3.I found that the converted document had many small black dots, and the same was true when printed.

Thanks.
windows-testpage.raster.zip
@tianmax
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tianmax commented Mar 21, 2023

I found (pwgtoraster_doc_t *) doc ->bi_ Level=1, which can solve this problem.

Thank you for your great efforts.

@tianmax tianmax closed this as completed Mar 21, 2023
tillkamppeter added a commit that referenced this issue Apr 5, 2023
@tillkamppeter
cfOneBitLine(): Dot grid on white areas in output
6007f6f 
When converting 8-bit grayscale (Black = 0, White = 255, 256 steps) to
1-bit dithered (16x16 dither matrix, Black = 0 pixels, White = 256
pixels, 257 steps), White got converted from 255 to 255 pixels in the
16x16 dither matrix, leaving 1 pixel in each 16x16 square black. Fixed
this off-by-one by explicitly setting all 256 pixels for white.

Fixes issue #20
@tillkamppeter tillkamppeter mentioned this issue Apr 9, 2023
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@tianmax
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tianmax commented Apr 12, 2023

I found:
if (*src >= threshold){
t |= 0x1;
}
It can also solve this problem, you can refer to it. Thank you very much for the recovery.

1 similar comment
@tianmax
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tianmax commented Apr 12, 2023

I found:
if (*src >= threshold){
t |= 0x1;
}
It can also solve this problem, you can refer to it. Thank you very much for the recovery.

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@tianmax