The picture loses of its color depth/ quality when loaded to the picturebox

[Syoam4ka]

Hi, when I use the following code:

Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
pictureBox1.DrawToBitmap(bmp, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
this.ClearPic();
this.pictureBox1.Image = bmp;

it seems like the quality of the picrture degrades and it loses of its color depth - why? How can I fix it?

Thanks

[Plater]

When you created your bitmap, it does not look like you specified the pixel depth(and etc), maybe you need to do that?

[Syoam4ka]

The picture drawn to the bitmap is some drawn lines - I have an Arraylist of points and it draws lines - Actually my target is to rotate that image - those drawn lines but I don't know how. So what I have done is created a bitmap of the picturebox "image" (i.e what's shown there - the Image property is actually null...) , reloaded that to the picBox.Image and then rotated it - but it loses its quality - I don't have any idea why - I am pretty new to c# graphics and don't know how to use pixels and so on...

I need a code sample for rotating the drawnlines with a matrix or somehing without creating that bitmap and loading it to the picbox Image , or an explanation and a solution as well to how make it save the quality of the loaded pic.

I prefer to rotate that using some code you know - but I don't know how to do that.

Please help me somehow.

Thanks.

[Plater]

Hmm is your picturebox square? Because if not, you could see some wierd stretching behavior

[Syoam4ka]

Oh man you're great!! that was it!! As you said I set the size - 400x400 and now it works fine!!

Thanks.

Now please if you can just answer my second question:

If I want to rotate the pic at a specific angle - say 50 degrees - there is no method such as rotate(50)... How can I accomplish that?

Thanks!!

[Plater]

Uhh I think you're going to need to do some serious math on that.
I think you need to take the formula for an elipse and find tangent points for every pixel in your picture, using the center of the picture as the center of your elipse, and then find the tangent point say 50degrees away from the first tangent point?
I've never really tried so I dunno.

[Syoam4ka]

Do you mean the trigo function - tan? How??! Oh my god!

And what about the elipse? Where did it come from and what's the connection?

Ouch that's a little difficult!

[Plater]

Well I said elipse because it's possible that the picture you wish to rotate is not a square. You need your bounding rectangle to be inscribed inside an elipse I think