how to change the pixel depth of the result image when using

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Last Post 24 Nov 2009 08:50 AM by anon

how to change the pixel depth of the result image when using math_doit?

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anon

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24 Nov 2009 08:50 AM
I am using MATH_DOIT for adding several bands. The pixel depth of origin bands is 16bit signed integer, after addition, some pixel value exceeds the 32768. But for the result of MATH_DOIT keep the pixel depth as 16bit signed integer, the real result is wrong. How can the result of MATH_DOIT be change to 32 bit signed integer?

MariM

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24 Nov 2009 10:14 AM
You can use the IDL FLOAT function to cast your data into 32-bit floating point or LONG to cast it into 32-bit longword integer data. For example: long(b1)+long(b2) where b1 and b2 are your 16-bit integer bands.

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