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Difference between revisions of "Post Processing and Effects"
Post Processing and Effects (view source)
Revision as of 14:03, 31 August 2023
, 14:03, 31 August 2023→Adding transparency
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The final result of the process is an original image layer that has a cutout, where all the image information that stands beyond this edge is marked specifically as having no content. This resulting image cannot be used as is, since the format used by the program is different than the one of your publishing medium. To achieve usable image files you need to export this picture into a format that holds transparency information, or the so-called alpha-channel. A common, modern format is PNG, that also offers slightly smaller files, without affecting image quality. Subsequent editing while maintaining the PNG format also has the additional advantage of portability beyond accuracy, as all the original information is well retained and possible to edit in just about any software. Exporting is quite well managed by most software information, being assumed that your image should contain all your original layers. In case this option is not well considered by default, you can specify it when asked by the program. | The final result of the process is an original image layer that has a cutout, where all the image information that stands beyond this edge is marked specifically as having no content. This resulting image cannot be used as is, since the format used by the program is different than the one of your publishing medium. To achieve usable image files you need to export this picture into a format that holds transparency information, or the so-called alpha-channel. A common, modern format is PNG, that also offers slightly smaller files, without affecting image quality. Subsequent editing while maintaining the PNG format also has the additional advantage of portability beyond accuracy, as all the original information is well retained and possible to edit in just about any software. Exporting is quite well managed by most software information, being assumed that your image should contain all your original layers. In case this option is not well considered by default, you can specify it when asked by the program. | ||
=== Chroma Keying | |||
No post processing and effects section is ever complete without chroma-keying. Although the end results are similar to adding transparency, chroma keying offers not only automated or simplified manual content creation but, most importantly, caters to video and movie or film production. In its most basic form, chroma keying helps by using a background colour that is rarely present in your subject, such as an extremely bright green, and simplifying the process of creating an artificial transparency around the subject, by extracting only that colour tone and leaving everything else intact. | |||
A successful chroma key depends on a lot of aspects, such as uniform lighting, the absence of the background colour on the subject, a good software processing that understands subtle intensity or saturation changes in the background and still treats the area as background, as well as good blending in the fringe area between the subject and the background. Despite looking deceivingly simple, success chroma keying requires a lot of processing. As a result of that, for photography purpose, chroma keying is only a post-processing effect. | |||
<code>''A good chroma key depends on uniform lighting and a good choice of background colour. A successful chroma keying setting can massively improve the chances of creating very good transparency effects on subjects with minimal effort in the post-processing stage.''</code> | |||