hi there,
I already try as your instruction but it is till 72 in
the result CMYK image.
I reviewed the jpeg_copy_critical_parameters() method
and can see this sensitive code
if (srcinfo->saw_JFIF_marker) {
if (srcinfo->JFIF_major_version == 1) {
dstinfo->JFIF_major_version =
srcinfo->JFIF_major_version;
dstinfo->JFIF_minor_version =
srcinfo->JFIF_minor_version;
}
dstinfo->density_unit = srcinfo->density_unit;
dstinfo->X_density = srcinfo->X_density;
dstinfo->Y_density = srcinfo->Y_density;
}
It seems that I need to set srcinfo->saw_JFIF_marker
value
but how can i do that??
Am i right or any other comment
thank for your help so far!!!
Dang Trong Hop
p/s:http://studio.imagemagick.org/pipermail/magick-bugs/2003-June/001336.html
I found a link about this problem on web..it seems the
problem is aware by community.
Best regards,
Dang Trong Hop
--- robert bergs <[EMAIL PROTECTED]> wrote:
> Hi,
>
> OK, it proved a little easier than I thought. All
> you need to do is apply this
> patch to add three lines to the jpegicc.c file in
> the jpegicc directory:
>
> @@ -446,8 +446,11 @@
> JSAMPROW ScanLineIn;
> JSAMPROW ScanLineOut;
>
> -
> -
> + //Preserve resolution values from the original
> +
> Compressor.density_unit=Decompressor.density_unit;
> + Compressor.X_density=Decompressor.X_density;
> + Compressor.Y_density=Decompressor.Y_density;
> +
> jpeg_start_decompress(&Decompressor);
> jpeg_start_compress(&Compressor, TRUE);
>
>
> This reads the resolution values from the
> Decompression object into the
> Compression object, thus preserving them. Recompile
> jpegicc and you should be OK!
>
> Sensibly, the code calls
> jpeg_copy_critical_parameters() to copy info from
> the
> Decompresion to the Compression objects.
> Unfortunately this does not copy the
> resolution information. (A bug? Feature?) It gets
> set to 72 dpi by default.
> According to Bob, we are not the first people to get
> caught out by this...
>
> This patch is based on lcms1-11. I have run it on a
> single test image under Free
> BSD but I cannot see why it should not work
> everywhere.
>
> Hope this helps!
>
> Rob.
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