What are common digital artifacts?
Aliasing refers to the jagged appearance of diagonal or curved
lines due to the square nature of pixels. Aliasing is mostly a
problem with files sizes which are too small, and when a photo is
interpolated beyond Veer's standards
Artifacts: Artifacts are
undesired effects to an image caused by the camera's sensor, lens,
and environmental variables. These include: blooming, chromatic
aberrations, jaggies, maze artifacts, moiré, ISO noise, and
Please see Posterization.
Blocking is an artifact which is usually a result of a data
compression algorithm or resampling an image too large. The
artifacts appear as large block of grouped pixels.
Please see Chromatic Aberration.
Cast: the effect of one of the color channels
dominates the overall tone or hue of the photo. Usually caused by
improper exposure, improper white balance setting and/or unusual
lighting conditions when shooting the original image.
cast is the effect of one color dominating the overall look of an
image and cause an overall shift in color. These shifts can affect
the colors of the highlights and shadows and cause an unnatural
Aberration: Chromatic aberration or blooming is
caused by light rays of different wavelengths coming to focus at
different distances from the lens. Aberrations are seen as color
fringes or halos along edges and around every point in
Highlights: Highlights are the lightest significant
of an image. When a highlight is clipped, there is a loss of
details which cannot be recovered.
Fringing: please see chromatic aberration.
Shadows: Shadows are the darkest significant part
of an image. When a shadow is filled, there is a loss of details
which cannot be recovered.
please see chromatic aberration.
Interpolation or resampling is an method to increase (or decrease)
the number of pixels in a digital image. Photo applications use
algorithms to enlarge the photo while minimizing the aliasing or
noise: please see Sensitivity (ISO).
Flare: Lens flare occurs when an image includes a
very bright light source, flare generated by a bright region can
have enough intensity to become very visible. The light produced by
flare mechanisms superimposes broadly across the image, adding
light to dark image regions and reducing image contrast. This
effect can be desired or not. Software can sometimes minimize or
remove lens flare, depending on the severity of the lens flare.
Jaggies is a non-technical, and more descriptive, name for
aliasing. Please see Aliasing.
Artifacts: maze artifact is a wavy moiré pattern
that begins to resemble a maze, usually observed in JPEGs.
Moiré patterns are undesired artifacts of images. Optical patterns
of lines can create a real and visible pattern of roughly
horizontal dark and light bands superimposed on the lines: this is
a moiré pattern.
Mottle is an artifact that appears as spots or blotches of
different color or shades of color within a continuous tone.
Noise in digital images is most visible in uniform surfaces, and is
similar to grain that we see in film. Noise increases with
sensitivity, especially the color noise in digital cameras. Higher
sensitivity (ISO) increases the chances of noise, but the
environment is also a factor. Please see Sensitivity (ISO).
Posterization is an artifact which occurs when a limited number of
tones are forced to cover a longer range than intended. This causes
visible banding or posterization, which are very noticeable in
smooth gradients such as skies.
Resampling: please see
Resolution: Refers to the
sharpness and clarity of an image. This is why Veer has set
standards on file size, to insure optimal image quality.
(ISO): Digital cameras set the level of sensitivity
to light by the ISO settings on the camera. Increasing the
sensitivity, requires less light. ISO noise is most common in the
shadows or areas of continous tone. Software filters can sometimes
minimize the noise, but sometimes the noise is beyond repair.
Dust: Dust has always been a concern for
photographers, and digital photography is no different. A dust
particle on a digital SLR sensor will show up in every photo,
appearing a as black smudge or spot. These spots created can
usually by addressed using Photoshop, but it can be time-consuming
since the spots will continue to appear in each and every image.
Photographers will need to periodically maintain their equipment to
ensure the sensor is clear of dust and debris.
Balance: The perceived color of an object is
affected by the color of the lighting under which it is viewed. The
human brain is able to detect and compensate for such changes in
perceived color. As a result, a white object will look white to
humans whether viewed in sunlight or under overcast skies, or
indoors. The color balance assumes that under normal conditions,
that if a white object can be made to look white, then the
remaining colors will be accurate too.