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April 2008

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2008.04.17 09:58 "a question about creating transparency of the image in TIFF", by <authletics@mail.ru>

2008.04.17 14:03 "Re: a question about creating transparency of the image in TIFF", by Frank Warmerdam

2008.04.17 15:18 "Re: a question about creating transparency of the image in TIFF", by Gerben Vos

2008.04.17 21:14 "Re: a question about creating transparency of the image in TIFF", by Chris Cox

2008.04.17 21:48 "Re: a question about creating transparency of the image in TIFF", by Bob Friesenhahn

2008.04.18 12:53 "Re: a question about creating transparency of the image in TIFF", by Edward Lam

2008.04.18 15:41 "Re: a question about creating transparency of the image in TIFF", by Bob Friesenhahn

2008.04.18 15:56 "Re: a question about creating transparency of the image in TIFF", by Edward Lam

2008.04.17 15:18 "Re: a question about creating transparency of the image in TIFF", by Gerben Vos

> ëÏÎÓÔÁÎÔÉÎ ìÕÃËÉÊ wrote:
> > Hi.  Can anyone help me ?  How can I create transparency of the image in TIFF? 

Frank Warmerdam wrote:
> The conventional approach is to create an alpha sample for each pixel, and
> set it to indicate transparent pixels.

For example, for RGB images (PhotometricInterpretation = 2) you can set
SamplesPerPixel to 4, and then indicate in the ExtraSamples tag that the
extra (fourth) sample is an alpha channel. Read the TIFF specification for more info.

					Gerben Vos.