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photograpghs - Coggle Diagram
photograpghs
vector verus raster
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JPEG, GIF and PNG are raster image extensions
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If the image is resized, then potentially will become blurry or distorted
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AI, PDF and SVG are vector image extensions
Allows you to create graphics that require resizing (logos, for example).
exposure
Exposure governs whether the photo is too dark, light or just right.
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All elements are expressed as a series of numbers, each half or double of the one before. They are called stops.
iso settings
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Art Galleries, Many galleries have rules against using a flash and being indoors are not well lit.
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focus
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Full press, without releasing button, takes shot.
Unable to get camera to focus on right object. Set focus on another object in image with half press of shutter button then move the camera and reposition focus area on object.
PNG
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Lossless compression: no data is lost upon compression and therefore is high quality but retains small file size
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As it produces high quality imagery, it produces sharp edges therefore it support images with text
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depth of field
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Point and shoot cameras and phone cameras generally have large DOF but shallow DOF can be achieved using 3 techniques
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large dof
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1/2sec, f16 ISO 100. Focal length 30mm
shallow dof
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Large f-stop opening, smaller f-stop number
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GIF
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Small file size because, as a vector image, the detail is stored a set of mathematical instructions
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Ideal for images that include flat, solid blocks of colours (no gradients)
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shutter speed
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Analogue camera curtain opened for the allocated shutter speed and shut. With a digital camera the sensor turns on for the allocated shutter speed then turns off.
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BMP
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Lossless compression: individual pixels of colour are saved without compression. Thus, compression makes little difference to the size of the file
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Ideal for printing, however, due to large file size, not appropriate for web graphics
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(Remember stops use a half or doubling sequence. Take a stop, Give a stop..)
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JPG/PEG
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Lossy compression: as you further compress the image file, the quality of the image decreases
Good format for printing detailed/colourful illustrations as it supports 24-bit colour (16,777,126 possible colours are available)
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Ideally, the final image should be saved into the size it is required
Exposure setting rule
If one element is altered, one of the other settings must also change if the same exposure is to be retained.