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Thread: PyQt QImage and BMP in 16bits 565 created from The Gimp

  1. 11th August 2010, 14:49 #1
    sebcbien
    sebcbien is offline Beginner
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    Aug 2010
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    Question PyQt QImage and BMP in 16bits 565 created from The Gimp

    Hi,

    I've got some trouble opening files saved by The Gimp in BMP 16bits 565. I've test some various bmp they all work except those saved from The Gimp and I really don't know why the format might be different from the one found there :http://wvnvaxa.wvnet.edu/vmswww/bmp.html
    Here are one "bleu.bmp" that cannot be read by qimage and test16bf565.bmp that is read properly.
    Bleu.jpgtest16bf565.bmp

    I've written a little program that load BMP and show them by a label with a pyQt window.
    It looks like this :

    Qt Code: 
    1. from PyQt4 import QtGui, QtCore
    2. import sys, os, wx
    3.  
    4. class Ui_ShowBmp(QtGui.QMainWindow):
    5.     def setupUi(self, ShowBmp):
    6.         ShowBmp.setObjectName("ShowBmp")
    7.         ShowBmp.resize(660, 529)
    8.         sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)
    9.         sizePolicy.setHorizontalStretch(0)
    10.         sizePolicy.setVerticalStretch(0)
    11.         sizePolicy.setHeightForWidth(ShowBmp.sizePolicy().hasHeightForWidth())
    12.         ShowBmp.setSizePolicy(sizePolicy)
    13.         self.centralwidget = QtGui.QWidget(ShowBmp)
    14.         self.centralwidget.setObjectName("centralwidget")
    15.         self.verticalLayout_2 = QtGui.QVBoxLayout(self.centralwidget)
    16.         self.verticalLayout_2.setObjectName("verticalLayout_2")
    17.         self.verticalLayout = QtGui.QVBoxLayout()
    18.         self.verticalLayout.setObjectName("verticalLayout")
    19.         self.label = QtGui.QLabel(self.centralwidget)
    20.         self.label.setPixmap(QtGui.QPixmap("Sample.bmp"))
    21.         self.label.setObjectName("label")
    22.         self.verticalLayout.addWidget(self.label)
    23.         self.loadButton = QtGui.QPushButton(self.centralwidget)
    24.         sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
    25.         sizePolicy.setHorizontalStretch(0)
    26.         sizePolicy.setVerticalStretch(0)
    27.         sizePolicy.setHeightForWidth(self.loadButton.sizePolicy().hasHeightForWidth())
    28.         self.loadButton.setSizePolicy(sizePolicy)
    29.         self.loadButton.setObjectName("loadButton")
    30.         self.verticalLayout.addWidget(self.loadButton)
    31.         self.verticalLayout_2.addLayout(self.verticalLayout)
    32.         ShowBmp.setCentralWidget(self.centralwidget)
    33.  
    34.         self.retranslateUi(ShowBmp)
    35.         QtCore.QMetaObject.connectSlotsByName(ShowBmp)
    36.  
    37.     def retranslateUi(self, ShowBmp):
    38.         ShowBmp.setWindowTitle(QtGui.QApplication.translate("ShowBmp", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
    39.         self.loadButton.setText(QtGui.QApplication.translate("ShowBmp", "Load", None, QtGui.QApplication.UnicodeUTF8))
    40.  
    41. class Ui_Extension(Ui_ShowBmp):
    42.     def __init__ (self):
    43.         self.app = QtGui.QApplication(sys.argv)
    44.         QtGui.QMainWindow.__init__(self)
    45.         self.window = QtGui.QMainWindow()
    46.         self.setupUi(self.window)
    47.         self.createSignals()
    48.         self.window.show()
    49.         self.curdir = os.getcwd()
    50.         (self.xsize,self.ysize) = ("0","0")
    51.  
    52.     def createSignals(self):
    53.         QtCore.QObject.connect(self.loadButton, QtCore.SIGNAL("clicked()"), self.pushedLoadBmpButton)
    54.     def pushedLoadBmpButton(self):
    55.         self.imagepath = QtGui.QFileDialog.getOpenFileName(self,"Select BMP", self.curdir, ("BMP (*.bmp)"))
    56.         (self.xsize,self.ysize) = self.getSize(self.imagepath)
    57.         self.image = QtGui.QImage(str(self.imagepath))
    58.         self.label.setGeometry(10, 10,int(self.xsize), int(self.ysize))
    59.         self.label.setPixmap(QtGui.QPixmap.fromImage(self.image))
    60.     def getSize(self,filepath): 
    61. '''Return the size from the bmp loaded'''
    62.         file = open(filepath,"rb")
    63.         fileread = file.read()
    64.         file.close()
    65.         header = fileread[:71]
    66.         xpixels = header[21:17:-1]
    67.         xlist = []
    68.         for c in xpixels:
    69.             data = str(hex(ord(c)))
    70.             if len(data) == 3:
    71.                 data = 'x0'.join(data.split('x'))
    72.             xlist.append(data)
    73.         xsize = int('0x'+''.join(''.join(xlist).split('0x')),base = 16)
    74.  
    75.         ypixels = header[25:21:-1]
    76.         ylist = []
    77.         for c in ypixels:
    78.             data = str(hex(ord(c)))
    79.             if len(data) == 3:
    80.                 data = 'x0'.join(data.split('x'))
    81.             ylist.append(data)
    82.         ysize = int('0x'+''.join(''.join(ylist).split('0x')),base = 16)
    83.         return (str(xsize),str(ysize))
    84.  
    85.  
    86.  
    87.  
    88.  
    89. class Ui_ShowBmp(QtGui.QMainWindow):
    90.     def setupUi(self, ShowBmp):
    91.         ShowBmp.setObjectName("ShowBmp")
    92.         ShowBmp.resize(660, 529)
    93.         sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)
    94.         sizePolicy.setHorizontalStretch(0)
    95.         sizePolicy.setVerticalStretch(0)
    96.         sizePolicy.setHeightForWidth(ShowBmp.sizePolicy().hasHeightForWidth())
    97.         ShowBmp.setSizePolicy(sizePolicy)
    98.         self.centralwidget = QtGui.QWidget(ShowBmp)
    99.         self.centralwidget.setObjectName("centralwidget")
    100.         self.verticalLayout_2 = QtGui.QVBoxLayout(self.centralwidget)
    101.         self.verticalLayout_2.setObjectName("verticalLayout_2")
    102.         self.verticalLayout = QtGui.QVBoxLayout()
    103.         self.verticalLayout.setObjectName("verticalLayout")
    104.         self.label = QtGui.QLabel(self.centralwidget)
    105.         self.label.setPixmap(QtGui.QPixmap("EswinRD640x480.bmp"))
    106.         self.label.setObjectName("label")
    107.         self.verticalLayout.addWidget(self.label)
    108.         self.loadButton = QtGui.QPushButton(self.centralwidget)
    109.         sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
    110.         sizePolicy.setHorizontalStretch(0)
    111.         sizePolicy.setVerticalStretch(0)
    112.         sizePolicy.setHeightForWidth(self.loadButton.sizePolicy().hasHeightForWidth())
    113.         self.loadButton.setSizePolicy(sizePolicy)
    114.         self.loadButton.setObjectName("loadButton")
    115.         self.verticalLayout.addWidget(self.loadButton)
    116.         self.verticalLayout_2.addLayout(self.verticalLayout)
    117.         ShowBmp.setCentralWidget(self.centralwidget)
    118.  
    119.         self.retranslateUi(ShowBmp)
    120.         QtCore.QMetaObject.connectSlotsByName(ShowBmp)
    121.  
    122.     def retranslateUi(self, ShowBmp):
    123.         ShowBmp.setWindowTitle(QtGui.QApplication.translate("ShowBmp", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
    124.         self.loadButton.setText(QtGui.QApplication.translate("ShowBmp", "Load", None, QtGui.QApplication.UnicodeUTF8))
    125.  
    126.  
    127.  
    128. def ShowBmp():
    129.     ui = Ui_Extension()
    130.     sys.exit(ui.app.exec_())
    131.  
    132. if __name__ == '__main__':
    133.     ShowBmp()
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    Thanks in advance for your help
    Last edited by sebcbien; 11th August 2010 at 14:53. Reason: Attach files
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