- #FREE ONLINE IMAGE CONVERTER FROM JPEG TO CMYK CODE#
- #FREE ONLINE IMAGE CONVERTER FROM JPEG TO CMYK WINDOWS#
Well, I think this is as far as I'll go with this. However, the final touch seems to go through the WIC (Win Imaging Component) and it seem to be used slightly different by the two classes. Using Reflector I can see that the ColorContext class relies heavily on the ICM API and this is used by both the Color- and FormatConvertedBitmap classes. If I spcecify the Jpeg encoder PhotoShop no longer recognizes it as a 8/CMYK but as 8/RGB, same as original (some features not supported?). Unfortunatily, it's only the Tiff encoder that works. And the printer may produce a better result out of it then my screen does. The colors are just ok, but then again the RGB->CMYK is not an easy conversion. This actually works (ta-da), I can open the new file in Photoshop and it recognizes it in a 8/CMYK format (Great). Stream cmykStream = new "C:\temp\mike4_CMYK.tif" ,įileMode.Create, FileAccess.Write, FileShare.Write) NewFormatedBitmapSource.DestinationFormat = PixelFormats.Cmyk32 īitmapEncoder encoder = new TiffBitmapEncoder() Į(BitmapFrame.Create(newFormatedBitmapSource)) NewFormatedBitmapSource.Source = myBitmapSource Stream imageStream = new "C:\temp\mike4.jpg" ,įileMode.Open, FileAccess.Read, FileShare.Read) īitmapSource myBitmapSource = BitmapFrame.Create(imageStream) įormatConvertedBitmap newFormatedBitmapSource = new FormatConvertedBitmap() NET framework 3.0 to get TiffBitmapEncoder working)
#FREE ONLINE IMAGE CONVERTER FROM JPEG TO CMYK CODE#
I emailed the code to you so you can have a look.
#FREE ONLINE IMAGE CONVERTER FROM JPEG TO CMYK WINDOWS#
In PS you can change the color space using the Windows ICM which is exactly the API's that I'm using, I just can't figure out what's wrong. However I'm not sure if there has to be some more profile in between !? I tried using two profiles the 'sRGB Color Space Profile.icm' and the 'USWebCoatedSWOP.icc' profile. The main API for making this pixel transformation, whether it be CreateMultiProfileTransform or CMCreateMultiProfileTransform, takes a list of color profiles. I think I'm missing something but I'm not sure what. However I can't seem to get the same result. I believe this is the way PS (and others) are converting color spaces in their programs. But this was simply "not good" and did not at all reveal the true converting to a CMYK value. I found on countless sites the formula for converting an RGB pixel to its CMYK variant. Well, I accepted the Tiff format and tried to find a way to convert the pixels from an RGB image. I could create a BitmapSource using this Cmyk32 pixelformat but the only encoder that accepted a cmyk frame was the TiffEncoder (wonder when MS is planning on finishing that one.). There was also a new enum '' that defined a Cmyk32 value. net framework 3.0 has added BitmapEncoder classes for Jpeg, Gif, Tiff and some other. PS to recognize it as being a CMYK image). net save an image tagged with the CMYK color space (for e.g. I've been trying different methods and concepts for hours, sweeping the net for all knowledge there is on this subject, still all I can produce is a CMYK image with badly converted colors.įirst I had to find a way to make. I'm afraid I've reached a dead-end on this. If you have a CMYK image (one you have converted using the code from the article) maybe you could send it to me and I could examine it some more. If you could examine a CMYK image along with its converted RGB variant then you might be able to come up with a pattern for converting the image data your self. You simply have to know how the 4 byte CMYK pixel is converted to the 3 byte RGB pixel. Unfortunatily, there's no pixel format defined for CMYK as far as I can see so using the same methods to reverse the format would not be possible. So, if you would set the pixel format to some other format than in the image being drawn image data will be converted. I guess it's the pixel format of the image from which the Graphics object is created that determines in what format the image will be drawn using DrawImage. This method is only a wrapper for the GdipDrawImageRectI in gdiplus.dll and there's no detailed info on that method to be found anywhere. Well, it seems to be the Graphics.DrawImage() method that does the magic.
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