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Date Posted: 03:09:51 01/18/02 Fri
Author: neural
Subject: Load TIFF in EPS files?

Dear Sir/Madam:
I've written a class TEPSGraphic based on you TTiffGraphic in order to read the embedded pixel tiff in eps files. Following is the implement:

TEPSGraphic = class(TTIFFGraphic)
public
procedure LoadFromStream(Stream: TStream); override;
end;

implementation

type
TEPSHeader = packed record
Magic: Cardinal;
PSOffset,
PSLen,
MetaPos,
MetaLen,
TiffPos,
TiffLen: Integer;
Checksum: SmallInt;
end;

procedure TEPSGraphic.LoadFromStream(Stream: TStream);
var
Header: TEPSHeader;
begin
Stream.ReadBuffer(Header, SizeOf(Header));
if Header.Magic <> $C6D3D0C5 then raise EInvalidGraphic.CreateResFmt(@SInvalidImage, ['EPS']);
Stream.Seek(Header.TiffPos - SizeOf(Header), soFromCurrent);
inherited;
end;

initialization
TPicture.RegisterFileFormat('EPS', gesEPS, TEPSGraphic);
finalization
TPicture.UnregisterGraphicClass(TEPSGraphic);

It works well on opaque eps files, but when loading transparent eps files(saved in Adobe Illustrator 9.0), I got following exceptions one by one:

1. ETiffError TIFFGetField: Tag = 296
2. ETiffError TIFFGetField: Tag = 282
3. ETiffError TIFFGetField: Tag = 283
4. ETiffError Unsupported bit count: 16

Can you tell me what's the problem? Thank you in advance.

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