Image conversion to Grayscale using ImageMagick is very dark

brightness, grayscale, image-processing, imagemagick, monochrome

Solution

The documentation states that when changing the color space, the colors are converted from their original gamma to linear before the conversion. You need to convert them back to an appropriate gamma.

convert infile -colorspace Gray -gamma 2.2 outfile

Problem

I converted a bunch of "normal" JPG photos via ``` convert infile -colorspace Gray outfile ``` to monochrome. However the result is for all images very dark. Here a sample conversion: original photo and converted monochrome image. Is there a better way to convert a photo-realistic image with ImageMagick to gray-scale?

Original source