Can a indexed pixel format be converted to some other format?

[**Developer**]

Seems that Dot.net can not handle files of Indexed Pixel Format as well as
other types of formats.

Given a file or and Image of type Indexed Pixel Format is there a method to
convert it to some other pixel format?


Thanks

 

[Bob Powell [MVP]]

..NET can indeed handle indexed pixel files. You can load an image in GIF
format and save it in JPEG format very simply. You just need the correct
ImageFormat setting.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
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[**Developer**]

I think my comment was too general by referencing all of DotNet.

I believe I got an exception when I tried to create a Graphics object for
such an Image object.

Thanks

 

[**Developer**]

Took me a while to run my program because VS2000. Couldn't run the debugger,
it told me to rerun Setup which I did. That took a while.

Anyway the following is the statement that causes the exception

mPicGraphics = Graphics.FromImage(PictureBoxDocument.Image)



The exception

System.Exception: A Graphics object cannot be created from an image that has
an indexed pixel format.
at System.Drawing.Graphics.FromImage(Image image)


Thanks

 

[Bob Powell [MVP]]

You don't need to get a Graphics object for an image that you want to save
in a different format.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

 

[**Developer**]

I want to do various thing with the image: crop it, copy to clipboard,
rotate it, ...
thanks

 

[**Developer**]

This is where I am now. Two problems:

1) I don't know what is a good PixelFormat to use.
What is the default?


2)ClonedBitmap has the same (Indexed) PixelFormat as ReadBitmap.
I was hopping it would be converted to Format32bppPArgb (even tho I don't
know that's a good one.)

Thanks for any help

Dim Filestream As Filestream = New Filestream(OpenFileDialog1.FileName,
FileMode.Open)

Dim ReadBitmap As New Bitmap(Filestream)

Dim CloneRect As New RectangleF(0, 0, ReadBitmap.Width, ReadBitmap.Height)

Dim ClonedBitmap = ReadBitmap.Clone(CloneRect,
Imaging.PixelFormat.Format32bppPArgb)

 

[Bob Powell [MVP]]

See the GDI+ FAQ

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

 

[**Developer**]

Bob

I just signed on to tell you that I had found the answers on your site.

Thanks