ImageEn Forum - Convert JPEG to compressed TIFF

Profile Join Active Topics Forum FAQ

Forum membership is Free! Click Join to sign-up
Username:	Password:
Save Password
Forgot your Password?

All Forums

ImageEn Library for Delphi, C++ and .Net

ImageEn and IEvolution Support Forum

Convert JPEG to compressed TIFF

New Topic

Reply to Topic

Author

Topic

JanN

5 Posts

Posted - Oct 16 2012 : 02:41:33

Hi,

I have several JPEGs which have to be merged into one compressed black/white TIFF file. Unfortunately I cannot make it work with at least one file.

First try produced uncompressed file:

Tiff.IO.LoadFromBuffer(@ImageData[1], Length(ImageData), ioJPEG);
Tiff.IO.Params.TIFF_Compression := TIOTIFFCompression.ioTIFF_G4FAX;
Tiff.IO.SaveToFileTIFF(ImageFile);

Second try produces smaller but corrupt file (page looks strange):

Tiff.IO.LoadFromBuffer(@ImageData[1], Length(ImageData), ioJPEG);
Tiff.IO.Params.TIFF_Compression := TIOTIFFCompression.ioTIFF_G4FAX;
Tiff.IO.Params.BitsPerSample := 1;
Tiff.IO.Params.SamplesPerPixel := 1;
Tiff.IO.SaveToFileTIFF(ImageFile);

Any thoughts?

Regards,
Jan

fab

1310 Posts

Posted - Oct 17 2012 : 11:22:35

Hi,
you have to specify the pixel format (black/white). You have two options:

1) set TIFF_PhotometInterpret (photometric interpretation):

Tiff.IO.Params.TIFF_PhotometInterpret := ioTIFF_BLACKISZERO;

2) convert your image to black/white (there are other options to convert to B/W, for example, dithering, threshold, etc..):

Tiff.IEBitmap.PixelFormat := ie1g;

JanN

5 Posts

Posted - Oct 17 2012 : 13:06:03

Thank you very much. Option no. 1 did the job. :)

Topic

New Topic

Reply to Topic