[Qgis-user] Generating black white from RGB landsat using Raster Map calculator?

[Chas Sheen]

Richard,

 

I should have made my initial query clearer.

I am trying to output a black and white geotiff.

Have split the original (landsat) image into RGB images.

When I apply the expression in the capture below, and hit run, nothing is saved to the results directory.

I’m assuming that my expression or something else in the raster calculator is wrong?

The final product that I’m after is a xyz grid where z is the black-white amplitude…which I think should be relatively easy (?) once I have the black-white image.

 

Chas Sheen

0448017282

 

From: Richard McDonnell [mailto:richard.mcdonnell at opw.ie] 
Sent: Wednesday, January 17, 2018 7:13 PM
To: Chas Sheen <chassheengeo at gmail.com>; qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator?

 

Chas,
Two options for splitting RGB into separate images in QGIS.

1.	Semi-Automatic Classification Plugin, Preprocessing, Split Raster Bands
2.	Grass r-rgb (Processing Toolbox)

Any one of these tools will split the Raster for you easy enough
Regards,

Richard

On 17/01/2018 00:48, Chas Sheen wrote:

I split the image into R, G, B

Worked out in QGIS wher the Raster map calculator is.

Run...several times

No result foud in Results Directory. It runs quickly then refreshes inputs and logs to blanks.

I'm new to QGIS....so have probably left out something basic.

Any clues

 








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Richard McDonnell
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