Re: How to get 24 bit RGB data ?

Subject: Re: How to get 24 bit RGB data ?

From: David Gelphman <email@hidden>

Date: Fri, 14 Oct 2005 11:01:18 -0700

Delivered-to: email@hidden

Regarding:

On Oct 12, 2005, at 5:01 PM, g w wrote:

hi, everyone!

    I have met a problem when I get 24 bit RGB data. In the hp SamplePM, I set the kPMRequestedPixelFormatKey as kPMRGB_24, the kPMRequiredBandHeightKey as 48*5, the kPMConverterResHorizontalKey as 600, the kPMConverterResVerticalKey as 600 in converterSetupTicket. I printed document in A4 paper.

    When debugging, I get the print data from the method of TEnginePCL::PrintBand(). In the bandBuffer data, the first line data is 24 bit RGB and it is correct. But from the second line to the last line, the data is 32 bit (kPMXRGB_32 pixel format) RGB data.

    Why the second line data is 32 bit RGB data ??

    And does the second line data begin from "bandBuffer + bandWidth * 4" ? ( bandWidth = (pageWidth * 600) / 72)

Thanks a lot!

I'm not certain that you've provided enough information to allow an answer to your questions, however:

While inspecting the code for the kPMRGB_24 code path, I see what looks like a bug. I suggest that you consider using the format kPMXRGB_32 and manual discard the X component of the data. This is what would be done for you if the kPMRGB_24 code path worked properly.

Have others successfully used the kPMRGB_24 code path? If so, it would be helpful to know.

David

_______________________________________________ Do not post admin requests to the list. They will be ignored. Printing mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/printing/email@hidden This email sent to email@hidden

Follow-Ups:

Re: How to get 24 bit RGB data ?
- From: David Gelphman <email@hidden>

References:

>How to get 24 bit RGB data ? (From: g w <email@hidden>)