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Groups > comp.lang.python > #44509
| Newsgroups | comp.lang.python |
|---|---|
| Date | 2013-04-29 10:20 -0700 |
| Message-ID | <aee818ca-e077-4e52-be55-7b8282684ba4@googlegroups.com> (permalink) |
| Subject | Can read in the BMP data correctly ,but the size is not right? |
| From | Jimmie He <jimmie.he@gmail.com> |
I'm trying to read in the BMP data by the the code below,and I'm check the data array with WINHEX,and it is correct,but which confuse me is why the size is 0x180,but the actual picture should be 48*48 = 0x120 bytes because I use 1-bit BMP not the 24bit BMP,could any one give some hints?
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__Head_Info = [
[ 'Type' ,0 , 2],#BM
[ 'FSize' ,2 , 4],#File Size
[ 'Reserved' ,6 , 4],#0x00000000
[ 'OffBits' ,10 , 4],#Offset of Image
[ 'SSize' ,14 , 4],# 40
[ 'Width' ,18 , 4],#Width
[ 'Height' ,22 , 4],#Hight
[ 'Planes' ,26 , 2],#1
[ 'BitCount' ,28 , 2],#{1,2,4,8,24}
[ 'Compress' ,30 , 4],#0
[ 'SizeImage' ,34 , 4],#Bytes Per Line
[ 'XPM' ,38 , 4],#2835
[ 'YPM' ,42 , 4],#2835
[ 'ClrUsed' ,46 , 4],#0
[ 'ClrImportant' ,50 , 4]#0
]
_Type =0;
_FSize =1;
_Reserved =2;
_OffBits =3;
_SSize =4;
_Width =5;
_Height =6;
_Planes =7;
_BitCount =8;
_Compress =9;
_SizeImage =10;
_XPM =11;
_YPM =12;
_ClrUsed =13;
_ClrImportant =14;
def __getInt( b, idx):
return binToInt(b,__Head_Info[idx][1],__Head_Info[idx][2])
def saveMatrixtoASC(bmpfilename,ascfilename):
try:
handle1=open( bmpfilename ,"rb")
raw = bytearray(handle1.read( ))
handle1.close
except Exception as E:
return "error:"+ str(E),""
datastart=__getInt(raw, _OffBits)
datasize =__getInt(raw, _SizeImage)
print ('Image Offset = 0x%X'%datastart)
print ('Image Size = 0x%X'%datasize)
handle2=open( ascfilename ,"w")
for i in range(0,datasize):
handle2.write('0x%02X,'%raw[datastart+i])
if (i+1) % 16 == 0 :
handle2.write("\n")
handle2.close
Back to comp.lang.python | Previous | Next — Next in thread | Find similar | Unroll thread
Can read in the BMP data correctly ,but the size is not right? Jimmie He <jimmie.he@gmail.com> - 2013-04-29 10:20 -0700
Re: Can read in the BMP data correctly ,but the size is not right? Chris Angelico <rosuav@gmail.com> - 2013-04-30 03:53 +1000
Re: Can read in the BMP data correctly ,but the size is not right? Peter Otten <__peter__@web.de> - 2013-04-29 19:57 +0200
Re: Can read in the BMP data correctly ,but the size is not right? Jimmie He <jimmie.he@gmail.com> - 2013-04-30 06:09 -0700
Re: Can read in the BMP data correctly ,but the size is not right? Jimmie He <jimmie.he@gmail.com> - 2013-05-04 03:26 -0700
Re: Can read in the BMP data correctly ,but the size is not right? MRAB <python@mrabarnett.plus.com> - 2013-04-29 19:10 +0100
Re: Can read in the BMP data correctly ,but the size is not right? 88888 Dihedral <dihedral88888@googlemail.com> - 2013-04-29 11:12 -0700
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