Corrupted output: TIFF&PNG properties

[darwinjob]

TIFF images with these properties:

Format: TIFF (Tagged Image File Format)
Mime type: image/tiff
Class: PseudoClass
Geometry: 15184x10224+0+0
Resolution: 1.55039x1.55039
Print size: 9793.68x6594.48
Units: Undefined
Colorspace: sRGB
Type: Palette
Endianess: MSB
Depth: 8/16-bit
Channel depth:
Red: 1-bit
Green: 16-bit
Blue: 1-bit

produce corrupted pyramids. The lowest pyramid level (no scale) is ok but all the others look like this:

After reconverting with IM -define tiff:tile-geometry=256x256 -type TrueColor -depth 8 -compress LZW:

Format: TIFF (Tagged Image File Format)
Mime type: image/tiff
Class: DirectClass
Geometry: 15184x10224+0+0
Resolution: 1.55039x1.55039
Print size: 9793.68x6594.48
Units: Undefined
Colorspace: sRGB
Type: Palette
Base type: TrueColor
Endianess: LSB
Depth: 8-bit
Channel depth:
Red: 1-bit
Green: 8-bit
Blue: 1-bit

pyramids are ok.

[darwinjob]

This PNG fails the same way:

Format: PNG (Portable Network Graphics)
Mime type: image/png
Class: PseudoClass
Geometry: 9110x6134+0+0
Units: Undefined
Colorspace: sRGB
Type: Palette
Base type: Undefined
Endianess: Undefined
Depth: 8-bit
Channel depth:
Red: 1-bit
Green: 8-bit
Blue: 1-bit

After applying IM -define png:bit-depth=8 -define png:color-type=2 it becomes:

Format: PNG (Portable Network Graphics)
Mime type: image/png
Class: DirectClass
Geometry: 9110x6134+0+0
Units: Undefined
Colorspace: sRGB
Type: Palette
Base type: Undefined
Endianess: Undefined
Depth: 8-bit
Channel depth:
Red: 1-bit
Green: 8-bit
Blue: 1-bit

and then the pyramid is ok. The main suspect is the indexed color: Class: PseudoClass, DirectClass

[darwinjob]

TODO: forward this to https://forum.image.sc/tags/c/usage-issues/7/bio-formats

[darwinjob]

This relates to #14
Currently the issue has a workaround: -rgb parameter to force the input image to be converted to RGB888 on a fly.