Sharpness

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Sharpness

Coordinates: 51°43′23″N 2°28′41″W / 51.723°N 2.478°W / 51.723; -2.478

Sharpness (/ʃɑːrpˈnɛs/ sharp-NESS) is an English port in Gloucestershire, one of the most inland in Britain, and eighth largest in the South West. It is on the River Severn at grid reference SO669027, at a point where the tidal range, though less than at Avonmouth downstream (14 metres (46 ft) typical spring tide), is still large (10 metres (33 ft) typical spring).

Just to the south lies Berkeley.

Docks

Sharpness docks began as a basin giving access to the Gloucester and Sharpness Canal. There were no port facilities at Sharpness itself and all traffic proceeded up the canal to Gloucester. The original Old Dock opened, with the canal, in 1827. The dock was separated from the Severn by a lock gate. The level of the basin varied for the hour or two for which the gate was open and so it was isolated from the canal by a lock with two gates. This lock was improved over time, expanding to be a ship lock of 163ft length and 38ft breadth and a smaller lock for trows of 81ft and 19ft. An intermediate lock gate was also provided in the larger lock, allowing shorter vessels to pass through more quickly and with less water consumption. A house for the Harbour Master was provided on the seaward dockside alongside the river gate. Today the Severn Area Rescue Association maintain a rescue station in the old house.

Acutance

In photography, the term "acutance" describes a subjective perception of sharpness that is related to the edge contrast of an image. Acutance is related to the amplitude of the derivative of brightness with respect to space. Due to the nature of the human visual system, an image with higher acutance appears sharper even though an increase in acutance does not increase real resolution.

Historically, acutance was enhanced chemically during development of a negative (High Acutance Developers), or by optical means in printing (Unsharp Masking). In digital photography, onboard camera software and image postprocessing tools such as Photoshop or GIMP offer various sharpening facilities, the most widely used of which is known as "unsharp mask" because the algorithm is derived from the eponymous analog processing method.

In the example image, two light gray lines were drawn on a gray background. As the transition is instantaneous, the line is as sharp as can be represented at this resolution. Acutance in the left line was artificially increased by adding a one-pixel-wide darker border on the outside of the line and a one-pixel-wide brighter border on the inside of the line. The actual sharpness of the image is unchanged, but the apparent sharpness is increased because of the greater acutance.

Sharpness (disambiguation)

Sharpness is port in Gloucestershire, England.

Sharpness may also refer to:

  • Sharpness (visual)
  • See also

  • Sharp (disambiguation)
  • Sharpening, for the creation of sharpness of a cutting tool or similar
  • Sharpness Point, Tyne and Wear, England
  • Radio Stations - Sharpness

    RADIO STATION
    GENRE
    LOCATION
    Retro Soul Radio London R&B UK
    Energy FM DJ Mixes Non-Stop Dance UK
    RadioFish Country,Oldies,60s UK
    Radio Wivenhoe Varied UK
    Scanner: VHF Marine Radio Public UK
    RAT Radio Varied UK
    Gem 106 Varied UK
    BBC York Varied UK
    Skyline Gold 60s,Soft Rock,Rock,Oldies,Easy,Country,Classic Rock,80s,70s UK
    BBC Hindi - Tees Minute News Updates,Indian UK
    BBC Radio 1 Pop UK
    Free Radio Herefordshire & Worcestershire Pop,Top 40 UK
    Miskin Radio Pop UK
    EKR - WDJ Retro Rock,Adult Contemporary,Soft Rock UK
    RollinRadio Electronica UK
    Hard House UK Dance UK
    My Social Radio Top 40 UK
    Flight FM Electronica UK
    Remarkable Radio Oldies UK
    80s And More 80s UK
    Sunshine Gold Oldies UK
    House FM Dance,Electronica,Jungle UK
    Jemm Two Indie Rock UK
    Rickhits Pop UK
    Dance Music 24/7 - EHM Productions 90s,Dance,Electronica UK
    Hope FM 90.1 Christian Contemporary UK
    Phoenix Radio Rock,Classic Rock UK
    Gold FM Radio Rock,90s,80s,Adult Contemporary,Pop UK
    87.7 Black Cat Radio Oldies,Pop UK
    Radyo 90 Sports,Folk,Pop UK
    Chester Talking Newspaper Flintshire Edition News UK
    URN College UK
    Sauce FM Dance UK
    Anfield FM Sports UK
    Sky News News UK
    Citybeat 96.7FM Adult Contemporary UK
    BBC Hindi - Din Bhar News Updates,Indian UK
    RWSfm Varied UK
    BBC Surrey Varied UK
    106 Jack FM Oxfordshire Adult Contemporary UK
    Bradley Stoke Radio Varied UK
    Energy FM Old School Classics Dance UK
    Deddington OnAir Rock,Pop UK
    Summer Time Radio 90s,Dance,Electronica UK
    Stomp Radio R&B UK
    Stress Factor Dance,Electronica UK
    Total Biker FM Rock,Punk UK
    BBC Manchester Varied,News UK
    BrooklynFM Rock,Classic Rock UK
    FRED Film Ch9 Romanian Talk UK
    Fantasy radio Varied UK

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