Convert from grayscale to sRGB colorspace

[q3cpma]

The tast I'm trying to accomplish isn't extraordinary but i'm failing hard at it. I've seen some forum topics, but their solutions didn't work for me.

Code: Select all

convert -colorspace sRGB -define "colorspace:auto-grayscale=off" -define "png:color-type=6" in.png out.png

Didn't work. Also tried with

Code: Select all

-set "colorspace:auto-grayscale" "false"

Thanks for reading.

[fmw42]

There is no equivalent -define to the -set option. I believe that is only available in current release, IM 6.9.2-0. You do not mention your version of IM nor platform.

[snibgo]

In modern versions of IM, grayscale is already in sRGB colorspace, meaning that it has a complex gamma curve that is roughly gamma=2.2.

What do you really want to do? How do you know you are not already doing it?

[q3cpma]

Sorry, I was using an outdated version. I needed PNG24 output to go with Vapoursynth's IM plugin.

Using

Code: Select all

convert -colorspace sRGB -set "colorspace:auto-grayscale" "false" in.png PNG24:out.png

worked.

Also, it looks like the -define option is listed here.

[fmw42]

Also, it looks like the -define option is listed here.

I recently asked the developer if there was a -define equivalent. He told me no. So I either misunderstood or he has recently added it.

[q3cpma]

Looks like it works too with -define (identify -format '%[colorspace]' out.png gives me sRGB).

[dlemstra]

I recently asked the developer if there was a -define equivalent. He told me no. So I either misunderstood or he has recently added it.

Or he works too much with IM7 This did not work in IM7 but does in IM6. We are now investigating how we can fix it in IM7.