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Re: How to read 16-bit UNSIGNED data [message #1744]

Fri, 18 February 1994 11:12

thompson
Messages: 584
Registered: August 1991

Senior Member

knipp@ipi.uni-hannover.de (K Knipp) writes:

> I have to read image data which are written as 16 Bit per Pixel,
> UNSIGNED and with a range of 0 to 65535.

> INTEGER Variable in IDL are defined to range from -32767 to 32768.

> Is the following way to read the data correct?

> OPENR, UNI, FILE, /GET
> I = ASSOC(UNI, INTARR(WIDTH,ROW),OFFSET)
> IMA = I(0)
> FREE_LUN, UNI

> IMA2 = LONG(IMA)
> POS = WHERE(IMA2 LT 0)
> IF POS(0) NE -1 THEN IMA2(POS) = IMA2(POS) + 65535L

Better would be to say

IMA2 = LONG(IMA) AND 'FFFF'X

Bill Thompson

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