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Date Posted: 09:27:35 06/08/00 Thu
Author: Bill Mears
Subject: Re: GrayScale images
In reply to: Michel 's message, "Re: GrayScale images" on 07:28:37 05/17/00 Wed

>
> Hi Joerg,
>
> As you have seen, the OnAcquire event returns a
> DibHandle from the scanner. Then
> AssignFromDIBHandle(DibHandle) is used to get the
> resulting image. Unfortunately, from a DibHandle
> (which is really a memory handle holding bitmap
> information), it is not possible to determine if an
> image is gray scale, as a gray scale image is really a
> color palette image with all palette entries having
> gray colors.
>
> JPEG does not support color palette images so this is
> why you are getting this error. You will need to
> change the format from ifColor256 to ifGray256
> yourself (by looking at the Palette property) before
> saving as JPEG.
>
> Best regards,
>
> Michel
>
> > Hi Michel,
> >
> > it's again me... Now I tried to scan and save
> > grayscale image but failed. Envision function to get
> > image format never returns gray scale (EnScan.pas).
> > Saving scanned image as JPeg creates exception like
> > "image must be grayscale or truecolor". Please check
> > it, thank you.
> >
> > Best regards from germany
> > Joerg
I tried using the "RequestedImageFormat" of ifGray256 to save as a Jpeg and I got the same error. The only way I could get the scan done was to save as a PCX as ifBlackWhite

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