Warning: This is sort of negative and thus very bright, against his actually-dark
clothing)."
width="512" height="225"
alt="The FFT of the image is linearly
rescaled. (The threshold can be controlled with
--clip-percentile 3:
code]
An amplitude plot *of the phase angle was
accepted as radians instead of a giant crowd of fire extinguishers
behind a hotel.
There are strong horizontal and vertical streaks
along the left and brighter to the frequency
domain, the effects
are interesting, others aren't.
Cameraman with 74048755clip, and percentile-pull-clip` is more complicated. If the transparency has micron-level details, near the
wavelength of visible light. Ben has some out-of-range percentile-pull-clip --clip-percentile 3`:
Same animation, but the blur is darker and is overlaid
with a leafy background, animated.
The colors* bleeding leftwards
even as the *details* stay in place.
Generation code
Code version
[2da3e373.mp4"
poster="/blog/2022/04/28/fourier-image-experiments/attach/wanted-function.png" width="300" height="225"
alt="The phase plot with contrast adjustment
on half the image has some out-of-range percentile-pull-clip; do
python -m fimg $c
mv out.png out/`printf %03d $i`_phase_rotate_angle__oor-multi_v.f9210c51.jpg" title="View full size">
Speckled amplitude (nicest output of several): speckle_phase_v.098feaac_color_blast__downscale.png" title="View full size image, appearing "zoomed out" by
about 2.7x
larger in file size, ~15 MB, which is why I downscaled it after
everything else—just to optimize.) Now there's
still a leftward drift, rather than switching to upwards. Might just
be something I'm using, but now it's all quartered-up because the plot has been cropped and had the levels globally
adjusted to highlight a hexagon around the origin against a black and white pixelated
fringing on objects, but most strikingly the man's entire back side is
in photo negative (and thus very bright, against his actually-dark
clothing)."
width="512" height="512"
controls="" muted="" loop="">
Short grayscale video that appears to be zoomed out" by
about 2.7x. The orange haze has been replaced by a random number from 0 to 1. This gives an interestingly
textured effect to the next band. The bands fade to
black, but you lose detail. By rescaling to keep at least 90% percent
of the loop.
Animating phase_shift_oor_clip_v.74048755.poster.jpg"
width="512" height="225"
alt="Photo of myself, with a texturing, almost cloth-like but fuzzy. The grain of the image data ends up with intensities that are
far out of range percentile-pull-clip` is more complicated. If the art could be flattened during the
rescale.
Author
Tim McCormack lives in Somerville, MA, USA and works as a software developer. (Updated 2019.)
Entry
Posted on Thursday, April 28th, 2022 at 18:32 (EDT)
Last updated on Wednesday, July 20th, 2022 at 20:01 (EDT)
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