Image

From Ultrafractal Wiki

see:

  Ron Barnett's tutorial "All About Images - Part 1":[1]
  Coloring Algorithm with image importation/image mapping:MMF Extended Cilia
  Creating Own Images for Import
  Image Coordinates
  Image File Organization
  Image Import
  Image Layer As Mask
  Image Mask
  Image Nibble
  Image Trap
  Image Wrapper
  Reverse Image Mask
  Selecting a Single Fractal Element for an Image

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Here are the UF5 image requirements:

Ultra Fractal imports JPEG, PNG, and BMP images. Only 24-bit or 32-bit BMP images are supported. Interlaced PNG files are not supported. The alpha channel from PNG files or 32-bit BMP files will be treated as transparency information for the image.

There is nothing about size. I suspect the problem is that your PNG files that don't open are in an interlaced format, which isn't supported.

Ron Barnett

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I just tested it here - UF will not import either 256 greyscale png or 256 colour png so such images need to be converted to full 24 or 32 bit pngs.

bye

Dave Makin