Legacy ImageMagick Discussions Archive

hi, i'm try to archive converting a bitmap to jpg cmyk ppi.
i set

           using (MagickImage image = new MagickImage(bmp))
            {
              image.ColorAlpha(new MagickColor("#FFF")); // You only need this when your image contains transparency.
              image.Settings.Density = new Density(nBmpPrm.dpi, nBmpPrm.dpi, DensityUnit.PixelsPerInch);
              image.AddProfile(ColorProfile.SRGB);
              image.AddProfile(ColorProfile.CoatedFOGRA39);     // USWebCoatedSWOP
              image.Write(fullPath);
            }

but in gimp now i see

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JPEG image
5,9 × 5,9 pixels/mm
sRGB built-in Default RGB working space

what's wrong?

thankyou

the same if i remove
image.AddProfile(ColorProfile.SRGB);

What is wrong with your result?

I guess your nBmpPrm.dpi was 150, and 150 dots per inch is 5.9 dots per millimetre.

thanks for your reply.

color space results sRGB, not cmyk

and i'd archive resolution units pixels/mm, as if i open other random image that says 150 × 150 ppi.

Gimp can't process CMYK images, so those are converted to sRGB when they are read. To find the colorspace of the jpg file, I suggest you use exiftool.

grat thank you.
for color space it's ok.
but still here the file worked with

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DensityUnit.PixelsPerInch

results in a Resolution Unit : cm.
is it possibile to make it sign as Resolution Unit : inches as the original image is?
thankyou

You said original image is bitmap. So as for a spec, its original unit is pixels per meter.
https://en.wikipedia.org/wiki/BMP_file_format

you're right, i make a shortcut in description.
My original image is jpg.
in my program to elaborate it I create a bitmap .net object.
if i save it with .net framework methods i get resolution in ppi
if i save it with imagemagick i get resolution in ppcm.

is it possibile to have an output jpg signed with Resolution Unit : inches ?

thank you

Legacy ImageMagick Discussions Archive

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