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Fix the pixel mapping and improve image processing

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The indexing of the byte array was wrong, which is why the images
produced had that funky spiral shape (which wasn't real). The polar
mapping was also incorrect (the tracks were mapped to cylinders and vice
versa).

Besides correcting these issues, improve the output by:
- Point scaling the source vertically by 3x to produce better-defined
  tracks
- Overlaying a "venetian blinds" pattern to add gaps between tracks
- Resizing horizontally to 3072 pixels to reduce aliasing
- 2x oversampling on the polar conversion again to reduce aliasing
This commit is contained in:
Hector Martin 2015-09-01 17:06:51 +09:00
parent 918d0cc019
commit 495d4ed903
1 changed files with 7 additions and 8 deletions
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15
DSK Image/DSK-Image.py
View File

@ -50,9 +50,8 @@ PIXELS = []
try:
byte = DSK.read(1) # read a byte
while byte !="": # while the file still has bytes in it
byte = DSK.read(1)
if len(byte) > 0: # the last byte, for whatever reason, is length 0. Bah.
BYTES.append(ord(byte)) # append the number representing the byte (0-255) to the BYTES array
BYTES.append(ord(byte)) # append the number representing the byte (0-255) to the BYTES array
byte = DSK.read(1)
except:
print("\n\nOops. Is " + INPUTFILE + " a DSK file of 143kb?\n\n")
@ -62,11 +61,10 @@ finally:
sys.stdout.write("\r Starting.\n\n")
for TRACK in range(0,TRACKS,1): # for each of the 35 tracks
for TRACK in range(TRACKS): # for each of the 35 tracks
LINE=[] # start a new line of pixels
for SECTOR in range(0,SECTORS*BYTESPERSECTOR,1): # write the bytes for the sectors in that track to the line array
offset = (SECTOR * TRACK) + SECTOR
LINE.append(BYTES[(SECTOR * TRACK) + SECTOR])
for SECTOR in range(SECTORS*BYTESPERSECTOR): # write the bytes for the sectors in that track to the line array
LINE.append(BYTES[(SECTORS*BYTESPERSECTOR * TRACK) + SECTOR])
sys.stdout.write("\r Track: " + str(TRACK))
sys.stdout.flush()
@ -92,7 +90,8 @@ OUTPUTFILE = os.path.join(INPUTFILE + ".png")
try:
subprocess.call(['convert', 'DiskImageTEMP.png', '-matte', '-virtual-pixel', 'transparent', '-resize', '1024x1024!', '-rotate', '90', '-distort', 'Polar', '512 110 512,512 -180,180', OUTPUTFILE])
subprocess.call(['convert', 'DiskImageTEMP.png', '-scale', '100%x300%', '-resize', '3072x!', '(', '-size', '3072x115', 'pattern:horizontal3', '-negate', '-alpha', 'copy', '-fx', '#000', ')', '-composite', '-virtual-pixel', 'HorizontalTile', '-flip', '+distort', 'Polar', '1024 220', '-resize', '50%x50%', OUTPUTFILE])
# convert the 4096x35px image to a square, rotate, then rotate around an axis.
except OSError:
print("\n\nOops. This script requires ImageMagick: http://www.imagemagick.org/")