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GDI+ output directly to CMYK JPG?

Posted on 2012-08-30
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Last Modified: 2012-09-11
I have an ASP.NET application using GDI+ to create a Bitmap to be displayed on the client's browser (as a JPG in an Image), and can also be downloaded as a JPG.

My problem is that the image will need to be printed, and a lot of commercial printers will only accept JPGs with colors specified in CMYK, not RGB.

I have looked at using a tool like ImageMagick to convert the RGB JPG to CMYK JPG after the former has been created... but this takes more time than the creation of the image to begin with (performance is an issue).

Is there anyway to output a CMYK JPG file directly from GDI+ ? I've been looking around the web, but have failed to find an answer.

Thanks.
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Question by:futuremoose
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CodeCruiser earned 1500 total points
ID: 38349147
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by:futuremoose
ID: 38389345
Ok... sorry to take so long getting back to this thread, but I only now finally got a chance to try out the suggestions above. The first link led to some code that claimed to work, but I could not get it to work... however, it led me eventually to another example posted here

http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/0a4fecba-6212-4e72-9e10-7874c6327e7a/

which I did get to work (code is just below). The output file's metadata confirms that the PhotometricInterpretation is "CMYK". Colors may be kind of messed up, but now I'll look for a way to apply a Color Profile (ICM or ICC) file. If I have trouble, I'll open another thread.

Anyhow, thanks CodeCruiser... I'll mark your comment as solution.

Imports System.Windows.Freezable
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.IO

Public Class Form1

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        '-------------------------------------------------------------------------------------------------------
        ' this example from: http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/0a4fecba-6212-4e72-9e10-7874c6327e7a/
        '
        ' this one does work... kind of. Colors seem messed up, and file size also much larger (as expected).
        '-------------------------------------------------------------------------------------------------------
        Dim imageStream As Stream = New FileStream("c:\temp\a.jpg", FileMode.Open, FileAccess.Read, FileShare.Read)
        Dim myBitmapSource As BitmapSource = BitmapFrame.Create(imageStream)
        Dim newFormatedBitmapSource As FormatConvertedBitmap = New FormatConvertedBitmap()
        newFormatedBitmapSource.BeginInit()
        newFormatedBitmapSource.Source = myBitmapSource
        newFormatedBitmapSource.DestinationFormat = PixelFormats.Cmyk32
        newFormatedBitmapSource.EndInit()
        Dim encoder As BitmapEncoder = New TiffBitmapEncoder()
        encoder.Frames.Add(BitmapFrame.Create(newFormatedBitmapSource))
        Dim cmykStream As Stream = New FileStream("C:\temp\a_CMYK.tif", FileMode.Create, FileAccess.Write, FileShare.Write)
        encoder.Save(cmykStream)
        cmykStream.Close()
    End Sub

End Class

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Author Closing Comment

by:futuremoose
ID: 38389348
Example pointed to did not actually work, but it led to one that did, which is good enough for me.
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