TIEGlobalSettings.AutoSetBitDepth

Declaration

property AutoSetBitDepth: Boolean;

Description

When enabled, PixelFormat is used as the authoritative source of bit depth, and sets SamplesPerPixel/BitsPerSample where they are not valid for that PixelFormat.
If enabled, it is suggested to set following properties:
  ImageEnView1.LegacyBitmap := False; // Do not use TBitmap (this is the default)
  ImageEnView1.IO.NativePixelFormat := True; // Use the original pixel format

The following properties may be affected by AutoSetBitDepth:
◼SamplesPerPixel
◼BitsPerSample
◼JPEG_ColorSpace
◼J2000_ColorSpace
◼TIFF_PhotometInterpret
◼TIFF_JPEGColorSpace

Note:
◼You can manually update bit depth using UpdateBitDepth
◼You may also want to enable AutoOptimizeOnSave

Default: False

Examples

// load a PNG and save a JPEG: don't care about pixel formats incompatibilities between file formats,
// for example when input.png is a 256 colors palette image, it will be converted to true RGB jpeg image.
IEGlobalSettings().AutoSetBitDepth := True;
ImageEnView.IO.LoadFromFile('input.png');
ImageEnView.IO.SaveToFile('output.jpeg');


// Convert a 32bit PNG file to an 8bit PNG (without transparency)

ImageEnView1.IO.LoadFromFile( 'D:\Alpha.png');

// Remove alpha channel and make background white
ImageEnView1.IEBitmap.RemoveAlphaChannel( True, clWhite );

// Set PixelFormat to 8bit
ImageEnView1.IEBitmap.PixelFormat := ie8p;

// Use PixelFormat as authoritative source of bit-depth
IEGlobalSettings().AutoSetBitDepth := True;

ImageEnView1.IO.SaveToFile('D:\No-Alpha.png');

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