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write_png weirdness [message #51524]

Thu, 23 November 2006 01:01

Bringfried Stecklum is currently offline

Bringfried Stecklum
Messages: 75
Registered: January 1996

Member

Hello,

I noticed that in IDL 6.1.1 there is some weirdness related to the write_png
procedure. I have true colour image like
>print,size(hhh)
> 3 3 640 512 1 983040
which I want to save as a negative. However,

write_png,'file',255-hhh

results in a PNG file which is just black while

write_png,'file',byte(255-hhh)

does the right thing. This seems a bit strange since both, hhh and 255 are of
type byte, and so should be the difference (without forcing it).

regards,

Bringfried Stecklum

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By: Bringfried Stecklum on Thu, 23 November 2006 01:01

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