Re: valid fields after PingImage()?

OK, I'll get my thing to detect Ping/Read contradictions and try to
fail gracefully.

Thanks Bob

On 18 January 2012 17:04, Bob Friesenhahn <[email protected]> wrote:
> On Wed, 18 Jan 2012, [email protected] wrote:
>>
>> I'm probably missing something!
>
> Probably not.  Functions like GetImageDepth() and GetImageType()
> normally expect to operate based on observed image pixels, which
> requires reading the image.  However, JPEG ping can surely do better
> than what it is apparently currently reporting.  A single-channel JPEG
> should be reported as grey and if libjpeg is built for 8-bits, then
> reporting the depth as 8 by default is reasonable.
>
> In ping-mode, each coder is responsible for setting the image
> properties based on what it can reasonably obtain based on reading
> only the image header.
>
> Bob
> --
> Bob Friesenhahn
> [email protected], http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>
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