Hod do you make a Bitmap bigger

[active]

How can I increase the size of a bitmap while preserving the image in it.

I tried (among many other things) :

b1 = New Drawing.Bitmap( b1, picData.Width, picData.Height)

and it doesn't seem to work.

I've searched the net and can find nobody that does it.

Is this a difficult thing to do? I can't seem to find the combination that
works.

Thanks for any help,

Cal

[Bernie Yaeger]

Hi Cal,

I'd recommend 3 products: microangelo, icon forge and icon gragger.

HTH,

Bernie Yaeger

" active" <ac****@REMOV Ea-znet.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

How can I increase the size of a bitmap while preserving the image in it.

I tried (among many other things) :

b1 = New Drawing.Bitmap( b1, picData.Width, picData.Height)

and it doesn't seem to work.

I've searched the net and can find nobody that does it.

Is this a difficult thing to do? I can't seem to find the combination that
works.

Thanks for any help,

Cal

[active]

Thanks but I'm talking VB.NET
cal

PS At least for a minute I thought someone had told me how - thanks for that
happy period.
"Bernie Yaeger" <be*****@cherwe llinc.com> wrote in message
news:On******** ******@TK2MSFTN GP12.phx.gbl...

Hi Cal,

I'd recommend 3 products: microangelo, icon forge and icon gragger.

HTH,

Bernie Yaeger

" active" <ac****@REMOV Ea-znet.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

How can I increase the size of a bitmap while preserving the image in it.
I tried (among many other things) :

b1 = New Drawing.Bitmap( b1, picData.Width, picData.Height)

and it doesn't seem to work.

I've searched the net and can find nobody that does it.

Is this a difficult thing to do? I can't seem to find the combination that works.

Thanks for any help,

Cal

[Herfried K. Wagner [MVP]]

* " active" <ac****@REMOV Ea-znet.com> scripsit:

How can I increase the size of a bitmap while preserving the image in it.

I tried (among many other things) :

b1 = New Drawing.Bitmap( b1, picData.Width, picData.Height)

and it doesn't seem to work.

I've searched the net and can find nobody that does it.

Is this a difficult thing to do? I can't seem to find the combination that
works.

Create a new bitmap object with the bigger size, then draw the old image
onto it. Sample for painting an image on another:

\\\
Dim b As New Bitmap(200, 200, ...)
Dim g As Graphics = Graphics.FromIm age(b)
g.DrawImage(... )
g.DrawImage(... )
g.DrawImage(... )
g.DrawImage(... )
g.Dispose()
b.Save(...)
b.Dispose()
///

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[active]

I have a bitmap, b1, that I need to enlarge while retaining the contents.
I tried to adapt your input but could not make it work.
I cut and paste to present what I have. picData is a PictureBox
I've tried creating b with the b1 in the constructor
I've tried cloning b1
I've tried everything I can think of

Private b1 As Drawing.Bitmap
Private g1 As Graphics

-snip Things like the following:
g1.DrawString( -snip Can not redo these statements to recreate bitmap

-snip Need to resize the bitmap since picData has resized - Does not work
Private Sub picData_Resize( ByVal se -snip
Dim b = New Drawing.Bitmap( picData.Width, picData.Height)
Dim g As Graphics = Graphics.FromIm age(b)
g.DrawImage(b1, 0, 0)
b1 = b
g1 = Graphics.FromIm age(b1)
picData.Invalid ate()

Private Sub picData_Paint( -snip
e.Graphics.Draw Image(b1, 0, 0)
End Sub

[Cor]

Hi active,

You can have a look for this to the drawing encoder class
Before you do it you have to no the codec of the picture or use a codec.

Most samples are in C#

You also can visit the dotnet drawing newsgroup for this.

I hope this helps?

Cor

[Bob Powell [MVP]]

'Load the original bitmap.

dim bm as bitmap=Bitmap.F romFile("filena me....")

'create a bigger one

dim bigbm as new Bitmap(bm.Width *2, bm.Height*2)

'get a graphics for the copy so you can draw on it.

dim g as Graphics=Graphi cs.FromImage(bi gbm)

'draw the original to the graphics.

g.DrawImage(bm, new Rectangle(0,0,b igbm.Width,
bigbm.Height),0 ,0,bm.Width,bm. Height,Graphics Unit.Pixel)

'dispose of the graphics.

g.Dispose()

'and the original

bm.Dispose() 'this closes the file.

'now save the bigger image...

bigbm.Save("fil ename...",Image Format.Bmp)
--
Bob Powell [MVP]
C#, System.Drawing

The November edition of Well Formed is now available.
Learn how to create Shell Extensions in managed code.
http://www.bobpowell.net/currentissue.htm

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

Read my Blog at http://bobpowelldotnet.blogspot.com

" active" <ac****@REMOV Ea-znet.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

How can I increase the size of a bitmap while preserving the image in it.

I tried (among many other things) :

b1 = New Drawing.Bitmap( b1, picData.Width, picData.Height)

and it doesn't seem to work.

I've searched the net and can find nobody that does it.

Is this a difficult thing to do? I can't seem to find the combination that
works.

Thanks for any help,

Cal

[TryingLikeHeck]

I ralize now that some of my problem was that the form containing the
Usercontrol that contained the PictureBox had a reference to the graphics
object I needed to update when I changed bitmaps.

I'll try both of your suggestions. I assume I'll be able to find the info about
the codec class in Help or MSDN since I don't understand what "Before you do it
you have to no the codec of the picture or use a codec." means.

Thanks for the info
Cal

[active]

The bitmap I have is the one I use to Paint the PictureBox (picData) with.
I get it like this:

Dim g As Graphics = picData.CreateG raphics

b1 = New Drawing.Bitmap( picData.Width, picData.Height, g)

g.Dispose()

g1 = Graphics.FromIm age(b1)
I need to leave the resize routine with b1 and g1 set to the new values.
I think that's what I'm having trouble doing because I can't draw after.

Thanks for the input
(especially if you revise it to fit the above, which I havn't had much luck
doing),
Cal

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:uR******** ******@TK2MSFTN GP09.phx.gbl...

'Load the original bitmap.

dim bm as bitmap=Bitmap.F romFile("filena me....")

'create a bigger one

dim bigbm as new Bitmap(bm.Width *2, bm.Height*2)

'get a graphics for the copy so you can draw on it.

dim g as Graphics=Graphi cs.FromImage(bi gbm)

'draw the original to the graphics.

g.DrawImage(bm, new Rectangle(0,0,b igbm.Width,
bigbm.Height),0 ,0,bm.Width,bm. Height,Graphics Unit.Pixel)

'dispose of the graphics.

g.Dispose()

'and the original

bm.Dispose() 'this closes the file.

'now save the bigger image...

bigbm.Save("fil ename...",Image Format.Bmp)
--
Bob Powell [MVP]
C#, System.Drawing

The November edition of Well Formed is now available.
Learn how to create Shell Extensions in managed code.
http://www.bobpowell.net/currentissue.htm

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

Read my Blog at http://bobpowelldotnet.blogspot.com