126:
414:" describes the "crawling ants" border used to highlight the active region.) Once a selection is created, further changes to the image will be confined to that area. To continue editing the rest of the image, the selection is either "deselected" or the entire image is selected. Advanced suites offer more ways to select portions of an image, as well as ways to combine these selections through.
29:
516:) of an image. Unsharp masking uses a blurred form of the image to increase contrast along regions of moderate contrast difference. Around edges, the blur region causes highlights to overexpose and shadows to underexpose. Taken to an extreme, the edges become overly visible and detract from the quality of the image—this is referred to as
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Unsharp masking has become automated in digital editing, with higher-end suites offering the process as a "tool" or "filter" in their standard sharpening kits—the actual creation of a mask is bypassed in favor of calculations that represent the mask's effect. The process depends on three factors: the
436:, but the effects are focused highly upon the extreme regions of the image. The blocking areas of the mask coincide with the highlights of the image, and the permissive areas with the shadows, resulting in more detail appearing in each.
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looking directly at the same scene. Adjusting the contrast in an image helps restore some of the perceived qualities of the original scene. These adjustments are typically performed on "blown-out" highlights, and "crushed" or "muddy"
475:, inverted, and blurred. The mask and original image are blended together to produce the final processed image. Some image editors allow for refinement of the effect by changing the strength of the blend.
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Liquid masks are preferred where precision is needed; they prevent paint from seeping underneath, resulting in clean edges. Care must be taken to remove them without damaging the work underneath.
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is the use of materials to protect areas from change, or to focus change on other areas. This can describe either the techniques and materials used to control the development of a work of art by
359:, which respectively lighten (reduce exposure) and darken (increase exposure) areas of an image. The tools a film photographer uses range from shaped pieces of black material (such as studio
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degree of contrast above which the effect will be applied. (Adjusting the threshold allows the editor to apply the effect selectively upon moderately defined edges and ignore
455:, which allows for a degree of softening on the mask. Its processing time is reduced so as to not completely oppose the original negative. Both negatives are combined and
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Unsharp masking allows the photographer to sharpen areas that have become blurred in the original negative, due to long shutter speed/exposure time, or from using a wide
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When creating the unsharp mask, extra space or diffusing material is added between the image and the mask to produce the necessary blur.
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can be switched between an editable greyscale image and a mask. They allow the user to create a mask using the suite's painting tools.
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in a particular way. Both films are then combined to produce a processed positive. The process is similar when applied using
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Unsharp masking is computationally more complex than other sharpening algorithms, but results in a higher-quality remedy.
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Image editors offer at the very least a "Select All" command and a rectangular "marquee" selection tool. (The word "
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a desired area from change; or a phenomenon that (either intentionally or unintentionally) causes a sensation to be
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190:, come with adhesive pre-applied. Solid masks are readily available in bulk, and are used in large painting jobs.
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colors. Photographic masks are peculiar in that they are produced from the image they will alter, an exercise in
482:, which adjusts the midtones of an image. Effects similar to contrast masking can be achieved by adjusting the
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version of the image is produced, either by desaturation or by calculating selected ratios of the image's
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166:'s dexterity and choice of applicator to control where paint is laid. Examples include the use of a
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is a simple solution. The processed image resembles what would be achieved when exposing through a
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or other adjustments are then applied, using the mask to selectively block portions of the image.
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Masking tape being peeled off of a canvas, to reveal the protected, unpainted area below
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to hold the mask in place while work is performed. Some, such as masking tape and
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allows for truer sharpening, but is much more complex than unsharp masking.
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Masks used to produce other effects are similar to those used in painting.
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Unprocessed, slight unsharp masking, then strong unsharp masking.
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When the contrast range of an image needs to be adjusted, a
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sharpness, as it cannot recover details lost to blurring.
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Contrast masking can be considered to be the opposite of
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Contrast masking is made simpler with digital editing. A
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53:. Unsourced material may be challenged and removed.
154:, in the sense that it hides the face from view.
174:to protect areas which are not to be painted.
289:are used to enhance the quality of an image.
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504:, an unusual term for a process intended to
374:To create a photographic mask, a sheet of
635:, producer of various products including
444:The mask is often made from high-quality
113:Learn how and when to remove this message
16:For the visual style used in comics, see
619:Contrast masking with Picture WIndow Pro
608:Contrast masking for Ilfochrome printing
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525:Unsharp masking does not increase the
394:of the working image is reduced to an
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500:A derivative of contrast masking is
51:adding citations to reliable sources
292:Representations of a scene—whether
148:The term is derived from the word
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382:to the original film negative or
345:The basic methods of controlling
133:In art, craft, and engineering,
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371:) to the photographer's hands.
162:Masking materials supplement a
38:needs additional citations for
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182:Most solid masks require an
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145:from conscious attention.
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675:Photographic techniques
575:of the effect, and the
637:pre-taped masking film
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434:neutral density filter
306:dynamic contrast range
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336:Controlling exposure
321:has occurred; or on
47:improve this article
670:Painting techniques
646:Masking Liquid H2O
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62:"Masking" art
571:of the blur, the
308:available to the
304:—do not have the
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680:Image processing
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424:Contrast masking
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494:Main article:
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45:Please help
40:verification
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653:, maker of
644:, maker of
581:image noise
512:sharpness (
323:desaturated
287:photography
242:Silk screen
201:Kraft paper
178:Solid masks
158:In painting
664:Categories
596:References
457:registered
396:image mask
139:protecting
73:newspapers
577:threshold
469:grayscale
327:recursion
310:human eye
261:or other
229:Polyester
197:products
143:concealed
103:July 2007
573:strength
549:/"fast"
547:aperture
519:halation
514:acutance
510:apparent
506:increase
378:film is
376:negative
347:exposure
319:clipping
263:polymers
237:Stencils
184:adhesive
560:Digital
463:Digital
412:marquee
406:Digital
400:filters
392:inverse
388:digital
356:burning
352:dodging
302:printed
267:Molten
224:Frisket
218:Plastic
188:frisket
168:stencil
164:painter
135:masking
87:scholar
651:Grafix
568:radius
527:actual
367:, and
315:shadow
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450:Kodak
369:paper
298:video
274:Gesso
259:Latex
220:film
195:Paper
94:JSTOR
80:books
551:lens
541:Film
508:the
440:Film
365:foam
361:foil
354:and
349:are
341:Film
294:film
231:tape
151:mask
66:news
583:.)
269:wax
170:or
49:by
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633:3M
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