[gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Cleo Drakos
Hi GDAL Developers, I have one GeoTIFF file with 2 bands. The data type is Byte. I want to calculate (Band2-Band1)/(Band2+Band1). But the following command provided a dark image: gdal_calc.py -A infile --A_band 1 -B infile, --B_band 0 --outfile outfile --calc (A-B)/(A+B) Does gdal_calc.py not

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Etienne Tourigny
I am not sure, but you can do the following to make sure: cp infile infile2 gdal_calc.py -A infile --A_band 1 -B infile2 --B_band 0 --outfile outfile --calc (A-B)/(A+B) Also, perhaps the extra comma in your command might be to blame -B infile, Etienne On Tue, Jul 29, 2014 at 3:46 AM, Cleo

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Cleo Drakos
Thanks for your response. I tried the followings: gcalc = 'C:\\Users\\cleo\\Documents\\gdalpys\\gdal_calc.py' ##I produced second file (b)as the copy of first(a) a = 'D:\\a.tif' b = 'D:\\b.tif' outfile = 'D:\\result.tif' expr = '(A-B)/(A+B)'

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Vincent Schut
On 07/29/2014 04:04 PM, Cleo Drakos wrote: Thanks for your response. I tried the followings: gcalc = 'C:\\Users\\cleo\\Documents\\gdalpys\\gdal_calc.py' ##I produced second file (b)as the copy of first(a) a = 'D:\\a.tif' b = 'D:\\b.tif' outfile = 'D:\\result.tif' expr = '(A-B)/(A+B)'

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Jukka Rahkonen
Cleo Drakos cleo21drakos at gmail.com writes: Thanks for your response.I tried the followings: gcalc = 'C:\\Users\\cleo\\Documents\\gdalpys\\gdal_calc.py' ##I produced second file (b)as the copy of first(a) a = 'D:\\a.tif' b = 'D:\\b.tif' outfile = 'D:\\result.tif' expr =

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Cleo Drakos
yes, I checked the histogram and the out image is completely black. cleo On Wed, Jul 30, 2014 at 1:53 AM, Jukka Rahkonen jukka.rahko...@mmmtike.fi wrote: Cleo Drakos cleo21drakos at gmail.com writes: Thanks for your response.I tried the followings: gcalc =

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Cleo Drakos
Even if I converted the input file into Float 32 at first, the resulted image is still totally black. cleo On Tue, Jul 29, 2014 at 11:20 PM, Vincent Schut sc...@sarvision.nl wrote: On 07/29/2014 04:04 PM, Cleo Drakos wrote: Thanks for your response. I tried the followings: gcalc =

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Jeremy Palmer
be: --calc (A.astype(int)-B A.astype(int)+B) Cheers Jeremy From: gdal-dev-boun...@lists.osgeo.org [mailto:gdal-dev-boun...@lists.osgeo.org] On Behalf Of Cleo Drakos Sent: Wednesday, 30 July 2014 2:06 p.m. To: Vincent Schut Cc: gdal-dev Subject: Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Cleo Drakos
*Subject:* Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file? Even if I converted the input file into Float 32 at first, the resulted image is still totally black. cleo On Tue, Jul 29, 2014 at 11:20 PM, Vincent Schut sc...@sarvision.nl wrote: On 07/29

Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

2014-07-29 Thread Cleo Drakos
-dev-boun...@lists.osgeo.org [mailto: gdal-dev-boun...@lists.osgeo.org] *On Behalf Of *Cleo Drakos *Sent:* Wednesday, 30 July 2014 2:06 p.m. *To:* Vincent Schut *Cc:* gdal-dev *Subject:* Re: [gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file? Even if I converted