Re: Preventing -extent from converting to RGB

On 2016-08-27 9:36 PM, [email protected] wrote:
>
> ----- Toby Thain <[email protected]> wrote:
>> Hi,
>>
>> I have a grey scale source image and I am applying a -rotate and an
>> -extent operation. I'm finding that the output is RGB, presumably
>> because of the background colour? Is there any way of getting the
>> equivalent of -extent without the RGB conversion? (I know I can add a
>> -channel to go back to greyscale, but it seems superfluous.)
>
> Did you try making the background a grayscale colour?

That was my first thought too, but the doc only talks about RGB colours; 
there was no obvious way to specify a single channel "colour." (Of 
course there may be a way I missed.)

--Toby

>
> Glenn
>
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