Libqpsd - Qt/C++ plugin for Photoshop Document (PSD/PSB )



  • Greetings!

    I started coding a plugin for Photoshop Document (PSD/PSB).
    This library is licensed under GNU LGPL.

    Critiques, contributors, developers, etc. are all welcome to visit "libqpsd on GitHub":https://github.com/Code-ReaQtor/libqpsd
    Thanks!



  • good stuff! You might find something useful in Krita repos..



  • [quote author="infoctopus" date="1358333656"]good stuff! You might find something useful in Krita repos..[/quote]

    Thanks!



  • "libqpsd":https://github.com/Code-ReaQtor/libqpsd now supports CMYK color mode!



  • Hi!

    Does this plugin have support for layers (access each layer as a separate image) and December 2012 psd file specification?

    Otherwise it looks awesome and may come in handy.



  • [quote author="Jake007" date="1364633374"]Hi!

    Does this plugin have support for layers (access each layer as a separate image) and December 2012 psd file specification?

    Otherwise it looks awesome and may come in handy.[/quote]

    Layers - NO
    Dec 2012 PSD Spec - YES

    It was based on the "PSD File Specification":http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/

    I have plans to support reading the "layers" but I still don't have the time to continue it. It only supports reading the "image data". Currently, I am working on reading the "curves" layer for Duotone (mono, duo, tri, quad) color mode. On the other hand, I don't have enough psd images for testing different color modes and using only Photoshop's "convert" feature so development might be a little slow.

    7 out of 8 color modes are already supported (partially). Feel free to try and test it! :D



  • This is gonna be an amazing plugin when it'll be finished.
    There will probably be a dozen different Photoshop versions being made, as they did with webkit and browsers :D .

    But for current project, I unfortunately need something that answers both of my questions with "yes".

    Keep up the good work!



  • [quote author="Jake007" date="1364647100"]This is gonna be an amazing plugin when it'll be finished.
    There will probably be a dozen different Photoshop versions being made, as they did with webkit and browsers :D .

    But for current project, I unfortunately need something that answers both of my questions with "yes".

    Keep up the good work! [/quote]

    Thanks!



  • Hi,

    we just integrated libqpsd to our image viewer (http://www.nomacs.org) .... it's really easy to use, the images look very good and we were all surprised by the loading times - you are fast as hell :)

    Thanks for sharing this great piece of code with the community

    Greetings



  • [quote author="sfiel" date="1366267531"]Hi,

    we just integrated libqpsd to our image viewer (http://www.nomacs.org) .... it's really easy to use, the images look very good and we were all surprised by the loading times - you are fast as hell :)

    Thanks for sharing this great piece of code with the community

    Greetings [/quote]

    You're welcome!!! :D

    Update: I am already working on PSB (Photoshop Big / Large Document Format) support and my initial codes are a success. I just need more time to test the codes on other color modes of PSB.

    (I don't have much PSB files on my machine and I am still searching for sites/people/friends who can give me a copy of their PSD/PSB files that are NOT on RGB mode. Thanks!)





  • Thank you!

    I will work on these, ASAP! :D



  • [quote author="asgohtals" date="1366364540"]hi,

    i have added some psbs to our ftp:
    "ftp://scruffy.caa.tuwien.ac.at/staff/diem/small-psb.zip":ftp://scruffy.caa.tuwien.ac.at/staff/diem/small-psb.zip
    "ftp://scruffy.caa.tuwien.ac.at/staff/diem/not-that-small-psb.zip":ftp://scruffy.caa.tuwien.ac.at/staff/diem/not-that-small-psb.zip
    the zips contain 3 images in Lab, CMYK and quadtone

    I hope they are of use for you.

    [/quote]

    Thank you again for there images! They were all very nice and libqpsd were able to read them!

    However, there still a bug in the Lab to RGB conversion and several pixels in the "wall-small-Lab.psb" are MISCALCULATED. The conversion algorithm were contributed by Yuezhao and we still don't have a perfect reference for the method other than "EasyRGB.com":http://www.easyrgb.com/

    Morever, I will update the libqpsd repository tonight :) Feel free to check it.



  • I have found a psd (CMYK) with wrong color conversions:
    "ftp://scruffy.caa.tuwien.ac.at/staff/diem/libpsd-cmyk.zip":ftp://scruffy.caa.tuwien.ac.at/staff/diem/libpsd-cmyk.zip
    we currently use the lipqpsd version from the ~17.04.2013 unfortunately, I cannot test it with the current github version as imageData.size() (qpsdhandler.cpp::730) is 0 for this image (did some interfaces change except for the refactoring?).



  • [quote author="asgohtals" date="1368800361"]I have found a psd (CMYK) with wrong color conversions:
    "ftp://scruffy.caa.tuwien.ac.at/staff/diem/libpsd-cmyk.zip":ftp://scruffy.caa.tuwien.ac.at/staff/diem/libpsd-cmyk.zip
    we currently use the lipqpsd version from the ~17.04.2013 unfortunately, I cannot test it with the current github version as imageData.size() (qpsdhandler.cpp::730) is 0 for this image (did some interfaces change except for the refactoring?).
    [/quote]

    Thank you for the image file. I just found out that it has 5 channels: cyan, magenta, yellow, key, and alpha... which is not actually tested with a real psd file. The original code takes the image in the arrangement A-C-M-Y-K which is incorrect. It should be C-M-Y-K-A. I just updated it with the bug fix.

    The new code should be working... to be sure try building it with the following lines uncommented:
    @
    qpsdhandler.cpp::25 //#include <QDebug>
    qpsdhandler.cpp::372-382 //#verification
    @

    If possible, use it on Qt Creator to get the debug output (when opening a psd file) then send me those outputs. Thanks.

    EDIT: Possible reason for imageData.size() becoming zero was that it falls under "Zip with/without prediction" type of compression. Currently, it ONLY supports Raw and RLE.



  • hi again,
    you have added:
    @if (format() == "psd") { // line 266...@

    to distinguish between psd/psb. The problem is, that we provide QPsdHandler directly with a buffer. Hence, the format() returns an empty string. Then, the compression value is loaded wrongly since in qpsdhandler.cpp::269 the skipRawData command is not executed. -However, for some cases (e.g. file prefetching) it would be cool to be able to call QPsdHandler with (already) loaded buffers.-
    EDIT: now that I have found how to set the 'format' properly, we can work with buffers & whatever we want...
    The call that didn't work was something like that (without line 10):
    @
    bool DkBasicLoader::loadPSDFile(QFileInfo fileInfo) {

    QFile file(fileInfo.absoluteFilePath());
    file.open(QIODevice::ReadOnly);

    QPsdHandler psdHandler;
    psdHandler.setDevice(&file); // QFile is an IODevice

    // EDIT: fixes the issues described:
    psdHandler.setFormat(fileInfo.suffix().toLocal8Bit());

    if (psdHandler.canRead(&file))
    return psdHandler.read(&this->qImg);

    return false;
    }
    @

    by the way, thanks for the fast CMYKA fix : )



  • [quote author="asgohtals" date="1369139349"]hi again,
    you have added:
    @if (format() == "psd") { // line 266...@ [/quote]

    Yeah, I added it since the "psb" update. There is a difference between "Layer and Mask Info Length" of PSD (4 bytes) and PSB (8 bytes) files. I can't find a workaround yet.... but I think the possible solution is to modify the "switch()" statement at line 186 into this:
    @ //Line 186
    switch (version) {
    case 1: setFormat("psd");
    break;
    case 2: setFormat("psb");
    break;
    default: return false;
    break;
    }
    @

    I won't update the repository right away, but tell me if this solution works. Thanks!



  • I have just tested the modified switch statement - it works perfect (psd & psb). it would be cool if you could add it to the repository : )



  • I made some major bugfixes today:

    Lab (w/alpha) to to RGB conversion. "Here":http://www.pixentral.com/show.php?picture=1sbw7IyUMILv6LmcbhxobqtjcQ5N1 is the link to the screenshot.

    16-bit RGB(A) and CMYK(A) support

    Used D50 reference (whitepoint) instead of D65.

    Too bad the image (wall-small-lab.psb) is too big and loading is still very slow. What are the options to prevent the GUI from freezing for some time? QEventLoop? etc?



  • The new Lab conversion is very nice.
    We simply load images in a thread in order to prevent the GUI from freezing:
    @
    void DkImageLoader::load(QFileInfo file, bool silent, int cacheState) {

    // loadFile() does the real loading job
    QMetaObject::invokeMethod(
    this,
    "loadFile",
    Qt::QueuedConnection,
    Q_ARG(QFileInfo, file),
    Q_ARG(bool, silent),
    Q_ARG(int, cacheState));
    }
    @

    in order to get this working, the 'DkImageLoader' needs to be moved to a worker thread:
    @
    // part of the DkImageLoader constructor
    qRegisterMetaType<QFileInfo>("QFileInfo");
    loaderThread = new QThread;
    loaderThread->start();
    moveToThread(loaderThread);
    @



  • Good day!

    Almost all color modes (Bitmap, Indexed, Grayscale, RGB, CMYK, Multichannel, Lab) in the following bit depth are supported now: 1bpc, 8 bpc, 16 bpc.

    All that is left is 32-bpc (HDRI, high-dynamic-range imaging). To render/convert it to 8 bpc (to QImage), it needs to be processed using "tone mapping":http://en.wikipedia.org/wiki/Tone_mapping

    I don't have any experiences on this and I am out of ideas now, so maybe somebody can help in implementing it.

    Thanks. I will appreciate any help. :D



  • [quote author="Code_ReaQtor" date="1353719546"]Greetings!

    I started coding a plugin for Photoshop Document (PSD/PSB).
    This library is licensed under GNU LGPL.

    Critiques, contributors, developers, etc. are all welcome to visit "libqpsd on GitHub":https://github.com/Code-ReaQtor/libqpsd
    Thanks![/quote]

    Good Works


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