Question: Load bmp and save as jpg

[Olaf Baeyens]

I want to convert one bitmap file to another one.
For example load as bmp and save as jpg.
The loading part is simple I do this:

Stream BitmapStream =
File.Open(sSrcF ile,FileMode.Op en,FileAccess.R ead,FileShare.N one);
Bitmap imgPhoto=new Bitmap(BitmapSt ream);
iPixelsX=imgPho to.Width;
iPixelsY=imgPho to.Height;
BitmapStream.Cl ose();

The saving will be something like this; but I fail to see how I can hook up
imgPhoto from the load to this stream.:

Stream DestBitmapStrea m =
File.Open(DstFi le,FileMode.Cre ateNew,FileAcce ss.Write,FileSh are.None);
// how do I connect imgPhoto?
DestBitmapStrea m.Close();

Also I wonder if the Pixelfomat is different, lest say I load 8 bit indexed
color palette bitmap and want to save as 24 bit RGB jpeg, could this be done
automatic?
Something tells me that I need to copy the bytes manually??? I hope not.

Many thanks.

Olaf

[Ollie Riches]

how about:

....
Size size = new Size(iPixelsX=i mgPhoto.Width, iPixelsY=imgPho to.Height);

Image sourceImage = Image.FromFile( "c:\\test.bmp") ;
Bitmap bitmap = new Bitmap(sourceIm age, size);
bitmap.Save("C: \\test.jpeg", ImageFormat.Jpe g);

bitmap.Dispose( );
sourceImage.Dis pose();

Check out Bob Powell's website for more on GDI+ etc...

http://www.bobpowell.net/gdiplus_faq.htm

HTH

Ollie Riches

"Olaf Baeyens" <ol**********@s kyscan.be> wrote in message
news:43******** *************** @news.skynet.be ...

I want to convert one bitmap file to another one.
For example load as bmp and save as jpg.
The loading part is simple I do this:

Stream BitmapStream =
File.Open(sSrcF ile,FileMode.Op en,FileAccess.R ead,FileShare.N one);
Bitmap imgPhoto=new Bitmap(BitmapSt ream);
iPixelsX=imgPho to.Width;
iPixelsY=imgPho to.Height;
BitmapStream.Cl ose();

The saving will be something like this; but I fail to see how I can hook
up
imgPhoto from the load to this stream.:

Stream DestBitmapStrea m =
File.Open(DstFi le,FileMode.Cre ateNew,FileAcce ss.Write,FileSh are.None);
// how do I connect imgPhoto?
DestBitmapStrea m.Close();

Also I wonder if the Pixelfomat is different, lest say I load 8 bit
indexed
color palette bitmap and want to save as 24 bit RGB jpeg, could this be
done
automatic?
Something tells me that I need to copy the bytes manually??? I hope not.

Many thanks.

Olaf

[Olaf Baeyens]

Hi Ollie,

That simple? :-)
Many thanks I will check into this.... :-)

how about:

....
Size size = new Size(iPixelsX=i mgPhoto.Width, iPixelsY=imgPho to.Height);
Image sourceImage = Image.FromFile( "c:\\test.bmp") ;
Bitmap bitmap = new Bitmap(sourceIm age, size);
bitmap.Save("C: \\test.jpeg", ImageFormat.Jpe g);

bitmap.Dispose( );
sourceImage.Dis pose();

Check out Bob Powell's website for more on GDI+ etc...

http://www.bobpowell.net/gdiplus_faq.htm