From 22f703cab05b7cd368f4de9e03991b7664dc5022 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Mon, 1 Sep 2014 13:56:46 +0200 Subject: Initial import of argyll version 1.5.1-8 --- tiff/contrib/win_dib/README.Tiffile | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 tiff/contrib/win_dib/README.Tiffile (limited to 'tiff/contrib/win_dib/README.Tiffile') diff --git a/tiff/contrib/win_dib/README.Tiffile b/tiff/contrib/win_dib/README.Tiffile new file mode 100644 index 0000000..82c6e5c --- /dev/null +++ b/tiff/contrib/win_dib/README.Tiffile @@ -0,0 +1,31 @@ +Frank, + +I attached a file that uses RGBA interface (tif_getimage.c) to read a tiff +file and convert to a DIB. It's advantage is that it is easy to read *any* +tiff file suported by libtiff and easily convert it to a DIB. The disadvantage +is that bilevel (B&W) bitmaps (and all other non-rgba images) are also +converted to RGBA, thus taking up 32x as much memory as needed (4 bytes per +pixel, rather than 1 bit). I read tiff files, but don't need to +write them. And my files are typically small, so the overhead is mostly +inconsequential. But for bilevel images, I overrode the get() and put() +routines of the RGBA interface to just copy the data from the input raster +to the output raster, rather than expanding out to full 32 bit format. It +would be nice if there were a simple way to handle all palletized images, +but that would take more custom routines, and it's not that important to me. + +Usage: + + m_pDIB = (PBITMAPINFOHEADER)::ReadTIFF(pathName); + if (m_pDIB != 0) { + m_format = IMAGETYPE_TIF; + } + +This is intended as Win32, but the modifications for new get() and put() +routines may be independent of platform. + +Thanks for your work supporting the forum and the library! + +Regards, + +Mark James +mark@james.net -- cgit v1.2.3