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Re: write_png weirdness [message #51523 is a reply to message #51506]

Thu, 23 November 2006 01:40

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

On Thu, 23 Nov 2006, Bringfried Stecklum wrote:

> 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).

255 is INT (255b is BYTE).

regards,
lajos

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[Message index]

		Re: write_png weirdness By: Bringfried Stecklum on Thu, 23 November 2006 12:33
		Re: write_png weirdness By: Foldy Lajos on Thu, 23 November 2006 01:40

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