TIFF Images Displaying White On Black

[esimnick]

I am having an issue with TIFF images not displaying correctly in all viewers. The images are B/W 200 DPI CCITT 4 Fax Compressed. They display fine in Corel's Paint Shop Pro 2 but not in any other viewer. In all the other viewers they are showing reversed (W/B). I am using Virtual Print Engine v6.00 SDK Windows x86 32-Bit Ansi Enterprise Edition. Below are the parameters I am setting for the export.

* Configure TIFF
.PictureType = PIC_TYPE_TIFF
.PictureExportDither = PICEXP_DITHER_MONO
.TIFFExportOptions = PICEXP_TIFF_APPEND + PICEXP_TIFF_CCITTFAX4
.SetPictureDefaultDPI(200, 200)

[IDEAL Software Support]

TIFF files do have a tag inside, which is named "Photometric Interpretation": It can have either the value "min-is-white" or "min-is-black". This flag controls whether a zero bit in the image bitmap is displayed white or black.

The programmers of the viewers you are using did not make their homework and they do not interpret this tag. You forgot one additional viewer (beside others), which does the job correct: If you import the TIFF file with VPE, it is also displayed correctly, because VPE does interpret this flag during import.

[esimnick]

Thanks for the explaination.