ImageEn Forum - TIFF - LZW compression

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TIFF - LZW compression - 16 bit

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graphman

259 Posts

Posted - Oct 12 2011 : 02:51:17

Is there a way to save file to TIFF format with LZW compression and 16 bit color depth?

How?

fab

1310 Posts

Posted - Oct 12 2011 : 03:04:59

You have to set BitsPerSample=16 and set the compression.
This example converts input file to 16 bit per channel and compress it using LZW:


  // load input.jpg
  ImageEnView1.IO.LoadFromFile('input.jpg');

  // convert image to 48 bit RGB
  ImageEnView1.LegacyBitmap := false;
  ImageEnView1.IEBitmap.PixelFormat := ie48RGB;
  
  // save as LZW, 16 bit per channel
  ImageEnView1.IO.Params.TIFF_Compression := IoTIFF_LZW;
  ImageEnView1.IO.Params.TIFF_PhotometInterpret := ioTIFF_RGB;
  ImageEnView1.IO.Params.BitsPerSample := 16;
  ImageEnView1.IO.Params.SamplesPerPixel := 3;
  ImageEnView1.IO.SaveToFile('output.tif');

graphman

259 Posts

Posted - Oct 12 2011 : 03:51:26

Thanks.

BUT

What these strings for?

// convert image to 48 bit RGB
ImageEnView1.LegacyBitmap := false;
ImageEnView1.IEBitmap.PixelFormat := ie48RGB;

fab

1310 Posts

Posted - Oct 12 2011 : 04:28:02

quote:
ImageEnView1.LegacyBitmap := false;

It tells ImageEn to use TIEBitmap instead of TBitmap. TIEBitmap can handle 16 bit per channel RGB images, while TBitmap cannot.

quote:
ImageEnView1.IEBitmap.PixelFormat := ie48RGB;

It converts current image (8 bit per channel RGB) to 16 bit per channel RGB.

graphman

259 Posts

Posted - Oct 12 2011 : 06:56:00

Thanks.

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