-grayscale documentation
Posted: 2017-11-30T11:13:40-07:00
The page at http://www.imagemagick.org/script/comma ... #grayscale is wrong, I believe, since -colorspace gray is currently non-linear.
The page says:
But should say
The page says:
Code: Select all
This will use one of the -intensity methods to convert the given image into a linear-grayscale image.
For example, to convert an image to (linear) Rec709Luminance grayscale, type:
convert in.png -grayscale Rec709Luminance out.png
which is equivalent to:
convert in.png -colorspace gray out.png
Similarly, to convert an image to (non-linear) Rec709Luma grayscale, type:
convert in.png -grayscale Rec709Luma out.png
which is equivalent to:
convert in.png -set colorspace RGB -colorspace gray out.png
Code: Select all
This will use one of the -intensity methods to convert the given image into a grayscale image.
For example, to convert an image to (linear) Rec709Luminance grayscale, type:
convert in.png -grayscale Rec709Luminance out.png
which is equivalent to:
convert in.png -set colorspace RGB -colorspace gray out.png
Similarly, to convert an image to (non-linear) Rec709Luma grayscale, type:
convert in.png -grayscale Rec709Luma out.png
which is equivalent to:
convert in.png -colorspace gray out.png