def adjustmentValueChanged(self, event):
value = event.getSource().getValue()
rowstride = min(width, value)
for j in range(0, min(height, int(width * height / value))):
System.arraycopy(pixelsCopy, j * value, pixels, j * width,
rowstride)
image.updateAndDraw()
def adjustmentValueChanged(self, event): value = event.getSource().getValue() rowstride = min(width, value) for j in range(0, min(height, int(width * height / value))): System.arraycopy(pixelsCopy, j * value, pixels, j * width, rowstride) image.updateAndDraw()
def unpackBits2(bytes_packedbits, tags, use_imagereader=False):
# Decompress a packBits-compressed image, returns an array of n_bytes.
# ra: a RandomAccessFile with the pointer at the right place to start reading.
# PackBits actually packages bytes: a byte-wise RLE most efficient at encoding runs of bytes
# 3 types of data packets:
# 1. two-byte encoded run packet:
# - first byte is the number of bytes in the run.
# Ranges from -127 to -1, meaning +1: from 2 to 128 (-count + 1)
# - second byte value of each byte in the run.
# 2. literal run packet: stores 1 to 128 bytes literally without compression.
# - first byte is the number of bytes in the run.
# Ranges from 0 to 127, indicating 1 to 128 values (count + 1)
# - then the sequence of literal bytes
# 3. no-op packet: never used, value -128.
# See documentation: http://paulbourke.net/dataformats/tiff/tiff_summary.pdf
# (note documentation PDF has its details flipped when it comes to the ranges for literal runs and packed runs)
# See also: ij.io.ImageReader.packBitsUncompress (a public method without side effects)
n_bytes = tags["width"] * tags["height"]
if use_imagereader:
return ImageReader(FileInfo()).packBitsUncompress(
bytes_packedbits, n_bytes)
bytes = zeros(n_bytes, 'b')
try:
indexP = 0 # packed
indexU = 0 # unpacked
while indexU < n_bytes:
count = bytes_packedbits[indexP]
if count >= 0:
# Literal run
System.arraycopy(bytes_packedbits, indexP + 1, bytes, indexU,
count + 1)
indexP += count + 2 # one extra for the 'count' byte
indexU += count + 1
else:
# Packed run
Arrays.fill(bytes, indexU, indexU - count + 1,
bytes_packedbits[indexP + 1])
indexP += 2
indexU += -count + 1
except:
print sys.exc_info()
finally:
return bytes
def intoImg(pixels):
img = ArrayImgFactory(UnsignedByteType()).create([4, 4])
System.arraycopy(pixels, 0,
img.update(None).getCurrentStorageArray(), 0, len(pixels))
return img
