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1

I was downloading the images from icloud.com 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 ...


2

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


2

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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