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Re: write_png weirdness [message #51506]

Thu, 23 November 2006 12:33

Bringfried Stecklum is currently offline

Bringfried Stecklum
Messages: 75
Registered: January 1996

Member

Fï¿½LDY Lajos wrote:
>
> 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
>
Uhmm, again the type trap.Seems I was not fully awake yet. Thanks for
pointing out the obvious.

regards,

Bringfried

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		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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