Skip to main content
Participant
September 3, 2026
Question

27.9.0: Creating simple black and white patterns(printing test patterns) in greyscale and converting to bitmap. If the first column is black the whole image goes black. to bitmap

  • September 3, 2026
  • 2 replies
  • 33 views

I’m trying to create simple black-and white stripe patterns for printing tests.  I’ll often start with the single-column marquee tool and use the paint bucket to fill the column.  When complete, I normally convert using 50% threshold.  This has worked for many years.

Now, it seems that if the first column is black when I do the conversion, the whole image goes black.  If the first column is not black the conversion is normal.

in greyscale becomes 

in bitmap, but 
 
this in greyscale converts normally to bitmap.

Same thing using 50% threshold or diffusion dither.

    2 replies

    c.pfaffenbichler
    Community Expert
    Community Expert
    September 5, 2026

    It seems I can’t reproduce the issue. 

     

    As an aside: 

    If you are amenable to using Pattern Layers (or Pattern Fill) you could create such patterns with a document (or Selection) Xpx wide and 1px high and just fill the first pixel black. 

     

    Claire H.
    Community Manager
    Community Manager
    September 3, 2026

    Hi ​@artistic_Solace3f32, Thank you for reporting this! While this is being investigated, here are a couple of workarounds:

    1. Start with a white first column. If your workflow allows it, begin your stripe pattern with white instead of black on the left edge. The conversion should then produce the correct result.

    2. Add a temporary white border. Before converting to bitmap, go to Image > Canvas Size and add 1 pixel to the left side (anchor right). After the bitmap conversion completes successfully, crop the extra pixel.

    3. Roll back to a previous version. If this is blocking your print production workflow, you can install an earlier version of Photoshop (pre-27.9.0) via the Creative Cloud app — go to the "..." menu next to Photoshop > Other versions.

    In the meantime, can you send your system info? You can find your system info by going to Help > System Info, copying and pasting it into a text file, and attaching it here. Thanks! ^CH