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I was downloading the images from to my windows PC and it was there that the problem occurred. the link you supplied gave the answer - a "long click" on the download button gives a pop up menu from which i could then choose "original size", so now I am getting 3023x4032 images. Still not quite as good as the oneplus, but in the ...


You can use ImageMagick commandline tool for that. If your image is already Black and White you simply do: convert input_file.tif -depth 1 output_file.tif If you have to make the file B/W just add -separate -black-threshold 128 (you can adjust the threshold for your needs). Here's the exiftool output for my sample file: Bits Per Sample : 1


On macOS you can use GNU Image Manipulation Program (GIMP) to create 1-bit TIFF files. With the image opened, go to Image > Mode > Indexed > (•) Use black and white (1-bit) palette > Convert Then File > Export As… > filename.tiff > Export. GIMP is a free and open source image editor.

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