[Gdal-dev] gDAL --> DIB

[Alain Rist]

Hi Bruce,

As Frank says all that is done by GDALCreateDib is call poDataset->GetRasterBand()->RasterIO() and cleanly fill a DIB with the result of these calls.

How RasterIO deals with size shrinks is a GDAL problem ;-)

BTW there is a (very) small bug in the code I posted at http://article.gmane.org/gmane.comp.gis.gdal.devel/2269/ . If someone requests I can post an updated version.

The XP GDI+ library is much more powerful than GDI. If you write a CGdalImage class derived from CImage, I will be glad to use it.

cheers
AR

----- Original Message ----- 
From: "Frank Warmerdam" <fwarmerdam at gmail.com>
To: "Clay, Bruce" <bclay at ball.com>
Cc: <gdal-dev at xserve.flids.com>
Sent: Tuesday, February 08, 2005 11:37 PM
Subject: Re: [Gdal-dev] gDAL --> DIB


> On Tue, 8 Feb 2005 17:20:12 -0500, Clay, Bruce <bclay at ball.com> wrote:
>>  
>> A question of Alain Rist or anyone that has been able to get the
>> CreateDibFromFile method he posted to work. 
>> 
>> I can load the images and display them in an MFC application but the images
>> are mostly white with very few features showing as compared to looking at
>> the same image in imageLinker or iView. 
>> 
>> Does anyone have any thoughts as to what could be causing this or another
>> method that might be used with windows apps to display GDAL data? 
> 
> Bruce, 
> 
> One obvious possible reason would be if you were loading 16bit
> data files.  All values larger than 255 would by truncated to 255. 
> However, I think you will need to provide some more information
> in order to get a concrete answer.  
> 
> Best regards,
> 
> -- 
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
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