How to Convert 'System.Drawing.Image' to 'System.Drawing.Bitmap'?

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GraphicsImage = new Bitmap(Panel1.Width, Panel1.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
openFileDialog1.Filter="JPEG|*.jpg";
GraphicsImage = Image.FromFile(openfiledialog1.FileName);

ERROR:

Error   1   Cannot implicitly convert type 'System.Drawing.Image' to 'System.Drawing.Bitmap'. An explicit conversion exists (are you missing a cast?)

Posted 16-Dec-10 1:04am

Shiza Khan

Updated 16-Dec-10 1:13am

Toniyo Jackson

v2

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Toniyo Jackson 16-Dec-10 7:13am

Always write your code inside code block

Manfred Rudolf Bihy 17-Dec-10 0:20am

I modified my answer to show two ways to make the image fit better into the panel it's displayed in.

3 solutions

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Khaniya · Accepted Answer · 2010-12-16T01:15:00

Solution 2

you have to change last line with following

GraphicsImage = (Bitmap)Image.FromFile(openfiledialog1.FileName);

Posted 16-Dec-10 1:15am

Khaniya

Updated 16-Dec-10 2:21am

v3

E.F. Nijboer · Accepted Answer · 2010-12-16T01:16:00

Solution 3

This would work better because they are the same type:

Bitmap graphicsImage = new Bitmap(Panel1.Width, Panel1.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

But there is no need to create it because it is overwritten 2 lines ahead when doing:

GraphicsImage = Image.FromFile(openfiledialog1.FileName);

Good luck!

Posted 16-Dec-10 1:16am

E.F. Nijboer

Comments

Manfred Rudolf Bihy 16-Dec-10 7:24am

Sorry but you got it the wrong way round. If in the first line the GraphicsImage were an image the error message would have been more like cant convert Bitmap to Image and not the other way aroung.
Close, but no cigar :). I do agree though that the creation of the bitmap is absolutely superflous.

E.F. Nijboer 16-Dec-10 7:33am

Thanks for the response. Well, I see (when looking at some of the other answers) that I forgot to mention that when loading the image from file, casting would also be necessary.

Manfred Rudolf Bihy 16-Dec-10 7:44am

Ok, Ok 5 for you too! :)

Manfred Rudolf Bihy · Accepted Answer · 2010-12-16T01:15:00

Solution 1

Exactly what the error message said.
You need to cast the Image to a Bitmap:

C#

GraphicsImage = (Bitmap)Image.FromFile(openfiledialog1.FileName);

By saying that an "explicit casts exists" you're hinted that you must do a type cast. Another verions is this:

C#

GraphicsImage = Image.FromFile(openfiledialog1.FileName) as Bitmap;

Modification:

You have two options if you want to make the image fit into the panel:

1. Keeping the images aspect ratio you need to make this adjustment

C#

panel1.BackgroundImageLayout = ImageLayout.Zoom;

2. Filling the whole panel with the image disregarding the aspect ratio of the image

C#

panel1.BackgroundImageLayout = ImageLayout.Stretch;

Caveat!
Solution 2 will leave you with a distorted image if the panel's dimensions don't match the dimensions of the image.

End Modification

That's it!

Cheers,
Manfred

Posted 16-Dec-10 1:15am

Manfred Rudolf Bihy

Updated 16-Dec-10 17:24pm

v5

Comments

Manfred Rudolf Bihy 16-Dec-10 7:30am

Ah, the univoter strikes again!

Shiza Khan 16-Dec-10 11:40am

But, now the problem is, that this image
GraphicsImage = Image.FromFile(chosenfile) as Bitmap; don't fits the whole panel size.
how can it be possible that GraphicsImage will also include the remaining panel area?

Shiza Khan 17-Dec-10 12:20pm

For my paint application, i draw everything first on the DrawingImage and then draw it to on the panel1.For it i had tried it like this...
Panel1.BackgroundImageLayout = ImageLayout.Zoom;
GraphicsImage = Panel1.BackgroundImage as Bitmap;
But this doesn't works well..:-(
At run time it give the exception unhandled: "Value cannot be null, Parameter name:image".

Manfred Rudolf Bihy 17-Dec-10 13:24pm

If Panel1.BackgroundImage is null you have not yet assigned an image to it. Somewhere in your code you need to do something like this:
Panel1.BackgroundImage = (Image) anExistingBitmapInYourApplication;
or like this:
Panel1.BackgroundImage = anExistingImageInYourApplication;

Shiza Khan 18-Dec-10 0:58am

OK..This had helped me alot..