[Mono-winforms-list] libgdiplus/System.Drawing patch: native support for indexed Bitmaps

[Peter Dennis Bartok]

Not sure what you are talking about, but libgdiplus uses libtiff for tiff 
handling...

Peter

----- Original Message ----- 
From: "Dan Maltes" <dan@astusa.com>
To: "DAN MALTES" <dan@astusa.com>; "'Jonathan Gilbert'" 
<2a5gjx302@sneakemail.com>; <mono-winforms-list@lists.ximian.com>
Sent: 16 March, 2005 14:19
Subject: RE: [Mono-winforms-list] libgdiplus/System.Drawing patch: native 
support for indexed Bitmaps


> LibTIFF for instance: http://libtiff.maptools.org/
>
> -Dan
>
> -----Original Message-----
> From: mono-winforms-list-admin@lists.ximian.com
> [mailto:mono-winforms-list-admin@lists.ximian.com] On Behalf Of Dan Maltes
> Sent: Wednesday, March 16, 2005 4:15 PM
> To: 'Jonathan Gilbert'; mono-winforms-list@lists.ximian.com
> Subject: RE: [Mono-winforms-list] libgdiplus/System.Drawing patch: native
> support for indexed Bitmaps
>
> Any chance there is existing TIFF loading code available that could be 
> used
> with permission in Mono?  Could save time.
>
> Dan Maltes
>
> -----Original Message-----
> From: mono-winforms-list-admin@lists.ximian.com
> [mailto:mono-winforms-list-admin@lists.ximian.com] On Behalf Of Jonathan
> Gilbert
> Sent: Wednesday, March 16, 2005 3:35 PM
> To: mono-winforms-list@lists.ximian.com
> Subject: Re: [Mono-winforms-list] libgdiplus/System.Drawing patch: native
> support for indexed Bitmaps
>
> At 02:08 PM 16/03/2005 -0300, Fabian Luque wrote:
>>> Probably the cleanest way to remove the warning, without making the
>>> code do an extra assignment when it doesn't have to, is to add a
>>> 'default' block that sets it to 'NULL':
>>>
>>>         default: default_palette = NULL;
>>
>>After making this change, libgdiplus compiled just fine.
>>
>>Now, when I open my 1bpp TIFF file and the save it to PNG I'm still
>>getting a 32bpp 180 KB file instead of a 1bpp file around 80 KB.
>
> The problem here is that because the TIFF format is massive and complex, I
> decided to postpone indexed TIFF loading support for a later patch. This
> patch does not alter the way the TIFF codec loads TIFF files, and as such
> they are upsampled to 32bpp at load time. Then, when you go to save the
> Bitmap, the PNG codec says "hmm, this is a 32-bpp RGB Bitmap object, so 
> I'll
> make a 24-bit RGB PNG file".
>
> Is it possible for you to pre-convert the TIFFs to another format, like 
> BMP
> or PNG, or is this the whole point of what you were trying to accomplish
> using System.Drawing? :-)
>
> Jonathan Gilbert
>
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