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ISO, Shutter Speed and Aperture
The shutter speed controls the amount of light by the length of time. The aperture (the size of the lens opening) controls the amount of light by the intensity via a series of different sized openings.
Sony a7 III User’s Guide
Adobe Photoshop
Photoshop is an image creation, graphic design and photo editing software developed by Adobe.

GIMP
(GNU Image Manipulation Program)
is a free and open-source raster graphics editor used for image manipulation (retouching) and image editing, free-form drawing, and more specialized tasks.
Gimp
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