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faster rotate and resize of images

is it just me or does anybody else find the Image.RotateFli p method kind of
slow? (I'm comparing to commercial softwares). Same for resizing. I'm using

sourceImage = system.drawing. bitmap.fromFile (filestring)
newImage = new bitmpa(sourceIm age, newWidth, newHeight)
newImage.save(n ewFileString)

Anyone knows of any faster methods?
Nov 23 '05 #1
7 3127
Hi,

what dou you call slow? Because I also resize images in my app and you don't
even see or notice that it happens

you can find my code at:

http://www.vb-tips.com/default.aspx?...5-3479119c0d1c

hth Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce
bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:23******** *************** ***********@mic rosoft.com...
is it just me or does anybody else find the Image.RotateFli p method kind of slow? (I'm comparing to commercial softwares). Same for resizing. I'm using
sourceImage = system.drawing. bitmap.fromFile (filestring)
newImage = new bitmpa(sourceIm age, newWidth, newHeight)
newImage.save(n ewFileString)

Anyone knows of any faster methods?

Nov 23 '05 #2
thanks Peter. I just went thru your code. It's almost the same as what I have.
what dou you call slow? Because I also resize images in my app and you don't
even see or notice that it happens
Well, for single images, you can't feel it, but in a batch job, like
100 images, the 'slowness' can be felt.

many thanks btw :-)


"Peter Proost" wrote:
Hi,

what dou you call slow? Because I also resize images in my app and you don't
even see or notice that it happens

you can find my code at:

http://www.vb-tips.com/default.aspx?...5-3479119c0d1c

hth Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce
bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:23******** *************** ***********@mic rosoft.com...
is it just me or does anybody else find the Image.RotateFli p method kind

of
slow? (I'm comparing to commercial softwares). Same for resizing. I'm

using

sourceImage = system.drawing. bitmap.fromFile (filestring)
newImage = new bitmpa(sourceIm age, newWidth, newHeight)
newImage.save(n ewFileString)

Anyone knows of any faster methods?


Nov 23 '05 #3
Hi Chad, could you post your code? It's always good to see how someone else
does something.
And how long does it take for you to resize 100 images? With a program I've
written about a year ago that creates thumbnails and resizes the original
images it takes 47sec to resize 504 images and create 504 thumbnails which
in my opinion is acceptable. But you don't need to forget that gdi+ just
isn't super fast. :-)

Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce
bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:BC******** *************** ***********@mic rosoft.com...
thanks Peter. I just went thru your code. It's almost the same as what I have.
what dou you call slow? Because I also resize images in my app and you don't even see or notice that it happens


Well, for single images, you can't feel it, but in a batch job, like
100 images, the 'slowness' can be felt.

many thanks btw :-)


"Peter Proost" wrote:
Hi,

what dou you call slow? Because I also resize images in my app and you don't even see or notice that it happens

you can find my code at:

http://www.vb-tips.com/default.aspx?...5-3479119c0d1c
hth Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:23******** *************** ***********@mic rosoft.com...
is it just me or does anybody else find the Image.RotateFli p method
kind of
slow? (I'm comparing to commercial softwares). Same for resizing. I'm

using

sourceImage = system.drawing. bitmap.fromFile (filestring)
newImage = new bitmpa(sourceIm age, newWidth, newHeight)
newImage.save(n ewFileString)

Anyone knows of any faster methods?


Nov 23 '05 #4
I had read somewhere that VB.Net 2005 would include a faster GDI+...is this
correct?
--
Dennis in Houston
"Peter Proost" wrote:
Hi Chad, could you post your code? It's always good to see how someone else
does something.
And how long does it take for you to resize 100 images? With a program I've
written about a year ago that creates thumbnails and resizes the original
images it takes 47sec to resize 504 images and create 504 thumbnails which
in my opinion is acceptable. But you don't need to forget that gdi+ just
isn't super fast. :-)

Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce
bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:BC******** *************** ***********@mic rosoft.com...
thanks Peter. I just went thru your code. It's almost the same as what I

have.
what dou you call slow? Because I also resize images in my app and you don't even see or notice that it happens


Well, for single images, you can't feel it, but in a batch job, like
100 images, the 'slowness' can be felt.

many thanks btw :-)


"Peter Proost" wrote:
Hi,

what dou you call slow? Because I also resize images in my app and you don't even see or notice that it happens

you can find my code at:

http://www.vb-tips.com/default.aspx?...5-3479119c0d1c
hth Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:23******** *************** ***********@mic rosoft.com...
> is it just me or does anybody else find the Image.RotateFli p method kind of
> slow? (I'm comparing to commercial softwares). Same for resizing. I'm
using
>
> sourceImage = system.drawing. bitmap.fromFile (filestring)
> newImage = new bitmpa(sourceIm age, newWidth, newHeight)
> newImage.save(n ewFileString)
>
> Anyone knows of any faster methods?


Nov 23 '05 #5
hi Peter, here's the code. Btw, it takes about 60sec to do 100images. But
then again, it really depends on the hdd. RAID will perform better, though.

'************** *************** *************** ***********

For i As Integer = 0 To UBound(ImageStr ing)

Dim sourceImg As System.Drawing. Image
Dim destImg As System.Drawing. Bitmap

sourceImg = System.Drawing. Bitmap.FromFile (ImageString(i) ) 'image
destImg = New Bitmap(sourceIm g, newWidth, newHeight) 'constructor

destFileName = destFolder & "\" & Path.GetFileNam e(ImageString(i ))

If ext = ".bmp" Then
destImg.Save(de stFileName,Syst em.Drawing.Imag ing.ImageFormat .Bmp)

ElseIf ext = ".jpg" Then
destImg.Save(de stFileName,Syst em.Drawing.Imag ing.ImageFormat .jpeg)

End If
sourceImg.Dispo se()
destImg.Dispose ()

sourceImg = Nothing
destImg = Nothing

Next
'************** *************** *************** ***********

"Peter Proost" wrote:
Hi Chad, could you post your code? It's always good to see how someone else
does something.
And how long does it take for you to resize 100 images? With a program I've
written about a year ago that creates thumbnails and resizes the original
images it takes 47sec to resize 504 images and create 504 thumbnails which
in my opinion is acceptable. But you don't need to forget that gdi+ just
isn't super fast. :-)

Greetz Peter

Nov 23 '05 #6
Hi Chad, I woul get
Dim sourceImg As System.Drawing. Image
Dim destImg As System.Drawing. Bitmap
out of the for loop

And maybe you can try this code to resize the images but I don't think it
will be much faster, the example is with fixed values which ofcourse isn't
the correct way to work.

sourceImg = DirectCast(Bitm ap.FromFile(fil es(i)), Bitmap)
destImg = New Bitmap(400, 400)
destImg .SetResolution( imgOrg.Horizont alResolution,
imgOrg.Vertical Resolution)
g = Graphics.FromIm age(destImg )
g.Interpolation Mode = Drawing2D.Inter polationMode.Hi ghQualityBicubi c
g.DrawImage(sou rceImg , New Rectangle(0, 0, 400, 400), 0, 0, sourceImg
..Width, sourceImg .Height, GraphicsUnit.Pi xel)
g.Dispose()
imgOrg.Dispose( )

And as you said yourself it also has got a lot to do with your computer
speed because I tested my method and your method on my pc And they both took
about 17 seconds (16.9 and 17.7 seconds) to resize 100 images

Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce
bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:0F******** *************** ***********@mic rosoft.com... hi Peter, here's the code. Btw, it takes about 60sec to do 100images. But
then again, it really depends on the hdd. RAID will perform better, though.
'************** *************** *************** ***********

For i As Integer = 0 To UBound(ImageStr ing)

Dim sourceImg As System.Drawing. Image
Dim destImg As System.Drawing. Bitmap

sourceImg = System.Drawing. Bitmap.FromFile (ImageString(i) ) 'image
destImg = New Bitmap(sourceIm g, newWidth, newHeight) 'constructor

destFileName = destFolder & "\" & Path.GetFileNam e(ImageString(i ))

If ext = ".bmp" Then
destImg.Save(de stFileName,Syst em.Drawing.Imag ing.ImageFormat .Bmp)

ElseIf ext = ".jpg" Then
destImg.Save(de stFileName,Syst em.Drawing.Imag ing.ImageFormat .jpeg)

End If
sourceImg.Dispo se()
destImg.Dispose ()

sourceImg = Nothing
destImg = Nothing

Next
'************** *************** *************** ***********

"Peter Proost" wrote:
Hi Chad, could you post your code? It's always good to see how someone else does something.
And how long does it take for you to resize 100 images? With a program I've written about a year ago that creates thumbnails and resizes the original images it takes 47sec to resize 504 images and create 504 thumbnails which in my opinion is acceptable. But you don't need to forget that gdi+ just
isn't super fast. :-)

Greetz Peter

Nov 23 '05 #7
yup, I tried it and it's about the same timings. Guess it's the best GDI+ can
do :-)

Chad

"Peter Proost" wrote:
Hi Chad, I woul get
Dim sourceImg As System.Drawing. Image
Dim destImg As System.Drawing. Bitmap


out of the for loop

And maybe you can try this code to resize the images but I don't think it
will be much faster, the example is with fixed values which ofcourse isn't
the correct way to work.

sourceImg = DirectCast(Bitm ap.FromFile(fil es(i)), Bitmap)
destImg = New Bitmap(400, 400)
destImg .SetResolution( imgOrg.Horizont alResolution,
imgOrg.Vertical Resolution)
g = Graphics.FromIm age(destImg )
g.Interpolation Mode = Drawing2D.Inter polationMode.Hi ghQualityBicubi c
g.DrawImage(sou rceImg , New Rectangle(0, 0, 400, 400), 0, 0, sourceImg
..Width, sourceImg .Height, GraphicsUnit.Pi xel)
g.Dispose()
imgOrg.Dispose( )

And as you said yourself it also has got a lot to do with your computer
speed because I tested my method and your method on my pc And they both took
about 17 seconds (16.9 and 17.7 seconds) to resize 100 images

Greetz Peter

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce
bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"chad" <ch**@discussio ns.microsoft.co m> schreef in bericht
news:0F******** *************** ***********@mic rosoft.com...
hi Peter, here's the code. Btw, it takes about 60sec to do 100images. But
then again, it really depends on the hdd. RAID will perform better,

though.

'************** *************** *************** ***********

For i As Integer = 0 To UBound(ImageStr ing)

Dim sourceImg As System.Drawing. Image
Dim destImg As System.Drawing. Bitmap

sourceImg = System.Drawing. Bitmap.FromFile (ImageString(i) ) 'image
destImg = New Bitmap(sourceIm g, newWidth, newHeight) 'constructor

destFileName = destFolder & "\" & Path.GetFileNam e(ImageString(i ))

If ext = ".bmp" Then
destImg.Save(de stFileName,Syst em.Drawing.Imag ing.ImageFormat .Bmp)

ElseIf ext = ".jpg" Then
destImg.Save(de stFileName,Syst em.Drawing.Imag ing.ImageFormat .jpeg)

End If
sourceImg.Dispo se()
destImg.Dispose ()

sourceImg = Nothing
destImg = Nothing

Next
'************** *************** *************** ***********

"Peter Proost" wrote:
Hi Chad, could you post your code? It's always good to see how someone else does something.
And how long does it take for you to resize 100 images? With a program I've written about a year ago that creates thumbnails and resizes the original images it takes 47sec to resize 504 images and create 504 thumbnails which in my opinion is acceptable. But you don't need to forget that gdi+ just
isn't super fast. :-)

Greetz Peter


Nov 23 '05 #8

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