Thanks!
This is exactly what I needed!
just curious: why do you want to eliminate every second line of an
image?
Video cameras interlace two images taken a fraction of a second apart
into a single frame, leading to interlacing artifacts (a serrated
edge on fast moving objects).
Your script will eliminate one of the fields, thereby isolating a
single "time slice" of reality.
This comes at the expense of 50% loss in vertical resolution.
Luckily, an HD image has 1080 pixels to start with, so 540 pixels
vertical is plenty for web use.
Thanks, can't wait to try it!
On Nov 12, 2007, at 3:34 PM, BNig wrote:
Hi Josh,
make a stack with 2 images, call them "P1" and "P2"
load a picture in the inspector into image "p1"
set the width and height to 140 in the inspector
make a new button
paste this script into the button
on mouseUp
put the width of image "P1" into theImagWidth
put the height of image "P1" into theImageHeight
put the imagedata of image "P1" into theDataToWorkon
if theDataToWorkon = "" then exit mouseUp
put length (theDataToWorkon) into HowLong
put empty into destImageData
-- one Pixel = 4 Bytes = 4 chars
put theImagWidth * 4 into OneRowOfImage
put theImageHeight into soManyPixelRows
put 0 into theCounter
repeat with i = 1 to (HowLong - OneRowOfImage) step
(OneRowOfImage*2)
put char i to (i + OneRowOfImage-1) of theDataToWorkon after
destImageData
end repeat
set the width of image "P2" to theImagWidth
-- watch out for images with uneven heigths
set the height of image "P2" to (theImageHeight/2)
set the imagedata of image "P2" to destImageData
end mouseUp
this should give you in "P2" an image half the height of P1 with every
second line of the original image.
it works for me, attention, almost no error checking in here,
it is important to have the width and height correct otherwise the
image
will be distorted
just curious: why do you want to eliminate every second line of an
image?
hth
Bernd
Josh Mellicker wrote:
Here's one for the image processing gurus out there:
How difficult is it to take an image, and create a new image
containing every OTHER line from it (e.g., just the odd lines) so the
resulting picture is half the height?
Once you knew the width of the image, isn't it just a loop that
copies tWidth pixels, then skips the next tWidth, and so on?
Thanks!
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