bild.halowerk.com · 12 listed services · provider site
Converts opaque pixels of a copy with at most 512 px on the long side to CIELAB (D65, IEC 61966-2-1). Near-neutral reference: mean shift in the a*b* plane starting at (0, 0) with neutral_radius (default 12; the first ste...
All frames are scaled to the same long side (the smallest long side, at most 768 px) so that measures are comparable. Sharpness is the mean noise-corrected Laplacian variance (variance − 20·σ², σ by Immerkær 1996) of the...
Finds strong edges (Sobel magnitude above the 90th percentile and at least 16) whose orientation lies within max_angle of horizontal on a copy with at most 800 px on the long side, votes them into an orientation-constrai...
Computes frequency-tuned saliency (Achanta et al., CVPR 2009): distance in CIELAB (D65) between each pixel of a 5×5 binomially smoothed copy and the image mean colour, on a copy with at most 400 px on the long side. For...
Reads the image header (dimensions after EXIF orientation, colour space, ICC profile description, bit depth, stored density, alpha and actual transparency) and relates it to the print size plus bleed on each side. Paper...
Blockiness: mean absolute luma difference across columns/rows at each of the 8 grid offsets divided by the mean elsewhere (1.0 = no blocking); analysed at native resolution on a central crop of at most 2048×2048 aligned...
Implements NIQE (Mittal, Soundararajan, Bovik, IEEE Signal Processing Letters 2013) following the LIVE reference code: grey image (rgb2gray weights, 8-bit), MSCN coefficients with a 7×7 Gaussian window (σ = 7/6), 96×96 p...
Uses the fast noise variance estimator of Immerkær (1996): the image is convolved with the 3×3 mask [1 −2 1; −2 4 −2; 1 −2 1], which cancels linear structure, and sigma = sqrt(π/2) · Σ|response| / (6·(W−2)(H−2)). Compute...
Analyses all opaque pixels (alpha ≥ 128) of a copy with at most 1024 px on the long side. The histogram uses 8-bit BT.709 luma of the encoded values. A pixel counts as clipped in the highlights when a channel reaches hig...
Converts the image to BT.601 luma at a fixed analysis size (long side analysis_max_side, default 1024; smaller images are not upscaled) and computes the variance of the 4-neighbour Laplacian (Pech-Pacheco et al. 2000) an...
Lays out every string with fontkit (advance widths and GPOS/kern kerning) in Liberation Sans Regular or Bold (OFL, metric-compatible with Arial) or your own font, adds letter spacing per character, wraps at spaces like C...
Parses the HTML (htmlparser2) and its CSS (postcss for <style> blocks, own parser for style attributes, css-what for selectors) and maps what it finds to 304 of the 306 detectable caniemail features: elements and attribu...
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