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

sfiel

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

Code_ReaQtor

[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!)

asgohtals

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.

Code_ReaQtor

Thank you!

I will work on these, ASAP! :D

Code_ReaQtor

[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.

asgohtals

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?).

Code_ReaQtor

[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.

asgohtals

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 : )

Code_ReaQtor

[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!

asgohtals

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 : )

Code_ReaQtor

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?

asgohtals

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);
@

Code_ReaQtor

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

bkerdev

[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