png()

[Peter Baumann]

png() does not properly consider the pixel type, ex:

select png( mr2*{1,1,1}) from m2

The above query delivers a wrong image as png() blindly takes every byte and puts it into a pixel, while a pixel here has more than one bytes.

Conversion should either use int pixel type (best) or issue a type mismatch if it expects 8bit values and receives 16bit values (2nd best solution).

Note: the other format converters should also be checked for proper type handling.

[Dimitar Misev]

This one works well

select png( mr2*{1c,1c,1c}) from mr2

It seems like the other one produces some sort of an overflow? #49 reported similar error

[Peter Baumann]

png() is deprecated, will be phased out in favor of encode(_,"png").