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TIFF scale when opened in Photoshop

I am importing the TIFF output file into photoshop and then rescaling by applying a %age transformation to get the required output size.  What scale is the original TIFF file when I download it.  Where can I find this information 

Dave Edwards

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If you scale the image in Photoshop it is likely that all of the georeferencing data and scaling will be lost. For GeoTiff data you should use QGIS or some other GIS software that will know what to do with that data and scale it accordingly without losing the tags. 

You want to look for the 'Translate' feature and set the 'outsize' to whatever percentage you want. 

Here is the sample command that should be shown:

gdal_translate -outsize 25% 25% filename.tif

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