Real-world algorithm demonstration, applied to a NASA portrait.Image: NASA / Eileen Collins · scikit-image (public domain)View source ↗
Prompt
Apply a Sobel Y effect in monochrome, emphasizing horizontal boundaries wherever brightness changes vertically. Render strong responses as bright narrow bands against black, with weaker gradients in gray. Suppress vertical boundaries and flat areas while retaining slightly soft edge thickness. Keep the original subject and composition.
Pay attention to the face, collar, and room lines.
Classification
Calculated image processing result.
Further examples · 7 images
02EmiMa-099-Sobel-yA human figure is rendered as a light gray outline on a neutral background. The Y-direction calculation emphasizes horizontal features like the top of the head, eyes, and collar lines.MartinThoma · CC0 · Wikimedia Commons03Canny GradientYA suburban house is shown with an embossed effect applied to its surfaces. The processing isolates horizontal lines on the roof tiles and window ledges while muting the vertical pillars.Tobias Hermann · CC BY-SA 3.0 · Wikimedia Commons04Sobel Y, applied to “Baustelle Hölzla 6066312”A construction worker sits at a horizontal table. The Sobel Y filter highlights the horizontal edges of the table and the bands on his vest while suppressing vertical lines.Ermell (photo); processed for the Atlas · CC BY-SA 4.0 · Wikimedia Commons05Sobel Y, applied to “Perth (AU), Elizabeth Quay Bridge -- 2019 -- 0346-8 (crop 2)”City buildings and a bridge span are visible against a dark sky. The filter emphasizes horizontal floor lines and window ledges while the vertical sides of the skyscrapers are faint.Dietmar Rabich (photo); processed for the Atlas · CC BY-SA 4.0 · Wikimedia Commons06Sobel Y, applied to “Water reflection of Hyangwonjeong Pavilion at Gyeongbokgung Palace in Seoul”A pavilion sits above a lake reflection. The roof lines and the horizontal water surface are brightly defined, showing vertical changes in brightness along horizontal boundaries.Basile Morin (photo); processed for the Atlas · CC BY-SA 4.0 · Wikimedia Commons07Sobel Y, applied to “High-Pressure-Cleaning-with-Personal-Protective-Equipment-01”A person in protective gear operates cleaning equipment. Horizontal edges of the wooden pallet and the ground surfaces are brightened, while vertical wall seams are largely invisible.CEphoto, Uwe Aranas (photo); processed for the Atlas · CC BY-SA 3.0 · Wikimedia Commons
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