Legacy ImageMagick Discussions Archive

Imagemagick handles some PSD files incorrectly.

I uploaded one: http://www.speedyshare.com/gmmhE/N071CUSB-A00.psd

It's just transparent background with black and red text on it, and Photoshop displays it as such.

But when I convert it with imagemagick:

convert N071CUSB_A00.psd -layers merge N071CUSB_A00.png

I end up with just black rectangle (with red text on it). So all transparency is gone. Setting backround to any color does not change anything. Creating Magick::Image from this file results in same black rectangle (with red bits).

Version: ImageMagick 6.8.0-8 2012-12-05 Q8 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC
Features: OpenMP

Your image has a layer and a precombined image. You want the precombined image with this command:

convert 'N071CUSB_A00.psd[1]' N071CUSB_A00.png

N071CUSB_A00.png has a transparent background, as expected.

But the problem is, I just want an image as it appears in Photoshop. Some other image would have something else in layer [1], whatever it is. What I uploaded is but one example.

And, additionally, I can not do this from Magick++'s Blob. I have no way of specifying this [1]: subImage/subRange do nothing, readImages applied to blob returns only one image (even though when I dump the blob to disk and then read it with readImages, it returns two)...

So far I indeed tried to work around this by dumping each file I access to to temp directory and loading it with [1] suffix. But it's a horrible solution. I'm working on a shell extension for displaying thumbnails for some files, and those archives I'm handling contain icons in PSD format. Accessing hard drive every time I want to display one (and people would have hundreds) is just wrong.

The precombined image is always the last image in the sequence of a PSD image file. The STL interface must be used to operate on image sequences or images (e.g. of format GIF, PSD, TIFF, MIFF, Postscript, & MNG) which are comprised of multiple image frames. Individual frames of a multi-frame image may be requested by adding array-style notation to the end of the file name (e.g. "animation.gif[1]" retrieves the second frame of a PSD image. See http://www.imagemagick.org/api/Image.php.

Like I wrote before, STL interface is not helping:

readImages applied to blob returns only one image (even though when I dump the blob to disk and then read it with readImages, it returns two)...

It works for us, here is a code segment:

Blob blob(static_cast<const unsigned char*>(blobData), blobLen);
delete [] blobData;

list<Image> first;
readImages( &first, blob ); // read all images into a STL list container
list<Image>::iterator last = first.end(); // point to the PSD pre-combined image
writeImages( --last, first.end(), "N071CUSB_A00.png", true ); // only write the pre-combined image to PNG

writeImages() sort of works, but there is no way to retrieve the Magick::Image from list<Image> first. first.size() returns 1. There is only one image inside (again, even though writeImages() writes two to disk), and it's the one without transparency...

We get two images and the expected results, we'll post the entire codeset:

Code: Select all

#include <Magick++.h>
#include <string>
#include <iostream>
#include <fstream>

#if defined(MISSING_STD_IOS_BINARY)
#  define IOS_IN_BINARY ios::in

#else
#  define IOS_IN_BINARY ios::in | ios::binary
#endif

using namespace std;
using namespace Magick;

int main( int /*argc*/, char ** argv)
{
  InitializeMagick(*argv);
  try
  {
    string
      testimage;
    
    // Read raw data from file into BLOB
    testimage = "N071CUSB_A00.psd";
    ifstream in( testimage.c_str(), ios::in | IOS_IN_BINARY );
    if ( !in )
      {
        cout << "Failed to open file " << testimage << " for input!" << endl;
        exit(1);
      }
    unsigned char* blobData = new unsigned char[100000];
    char* c=reinterpret_cast<char *>(blobData);
    size_t blobLen=0;
    while( (blobLen< 100000) && in.get(*c) ) {
      c++;
      blobLen++;
    }
    if ((!in.eof()) || (blobLen == 0))
      {
        cout << "Failed to read file " << testimage << " for input!" << endl;
        exit(1);
      }
    in.close();

    // Construct Magick++ Blob
    Blob blob(static_cast<const unsigned char*>(blobData), blobLen);
    delete [] blobData;

    list<Image> first;
    readImages( &first, blob );
    list<Image>::iterator last = first.end();
    writeImages( --last, first.end(), "N071CUSB_A00.png", true );
  }
  catch( Exception &error_ )
  {
    cout << "Caught exception: " << error_.what() << endl;
    return 1;
  }
  catch( exception &error_ )
  {
    cout << "Caught exception: " << error_.what() << endl;
    return 1;
  }
  return 0;
}

This code works for me to, see, but I do not want to write images to disk. I want to keep working with them, in memory, without touching disk.

For this purpose I want to retrieve the second picture from the first list in that code, presumably by writing:

Code: Select all

    list<Image> first;
    readImages( &first, blob );
    list<Image>::iterator last = first.end();
    --last;
    Image icon=*last;

And then icon should contain that second image (with transparency).

But what actually happens is that icon is still a black rectangle without transparency. writeImages() does work as intended, for me too, but getting two pictures from it is impossible: the list first has only one element, only one picture.

So if you add

Code: Select all

icon.write("a.png")

To the code I posted, you'll get a black rectangle, not nice transparent picture.

We're using ImageMagick 6.8.1-3 and we get expected results (transparent background) for a.png:

...
list<Image> first;
readImages( &first, blob );
list<Image>::iterator last = first.end();
last--;
Image icon=*last;
icon.write("a.png");

I guess It was a bug in my build.

I re-downloaded the library and rebuilt it, and voila, it now works as it should.

Thank you!

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