Seeing Through an Image

CHM Tech

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In computer graphics, there are two types of transparency.

The first is full transparency which basically describes something that is completely invisible, and it’s usually applied only to parts of an image. Of course, it can be applied to the entire image, but then there would be nothing to see.

And the second is partial transparency, which describes graphics that are, surprise-surprise, only partially transparent. So they’re visible to an extent, but so are the ones in the background. This kind of transparency is also commonly referred to as translucency, and computers usually simulate it by mixing colors.

In most computer graphics editors, transparency is represented with a distinct pattern, most commonly a checkerboard, and it’s supported in a number of raster or bitmap file formats, including: PNG, GIF, JPEG 2000, BMP and TIFF.

In optics, transparency is the physical property of a material that allows the transmission of light. Here's how that is simulated in computer graphics!

► Sources and references:

- Lesa Snider: ‘’Photoshop CS4: The Missing Manual: The Missing Manual’’
https://books.google.ba/books?id=f38qA2yg0PYC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false

- Technopedia: ‘’Alpha Channel’’ https://www.techopedia.com/definition/1945/alpha-channel

- Lynda.com: ‘’Selections, alpha channels, and layer masks, oh my!’’ https://www.lynda.com/Photoshop-tutorials/Selections-alpha-channels-layer-masks-oh-my/126063/138381-4.html

- Wikipedia: ‘’Transparency (graphic)’’
https://en.wikipedia.org/wiki/Transparency_(graphic)
‘’Alpha compositing’’ https://en.wikipedia.org/wiki/Alpha_compositing

Why glass is transparent:
https://www.youtube.com/watch?v=Omr0JNyDBI0
https://www.youtube.com/watch?v=VwRLIt6jgdM

► Used videos:

- Movieclip Extras (youtube): ‘’The Avengers Featurette - Industrial Light & Magic (2012) - Joss Whedon Movie HD’’ https://www.youtube.com/channel/UC4l6ZhkOzxIxvCSzDr4HKqg

- Jason Jones (youtube): ‘’Clipping Paths in Photoshop’’ https://www.youtube.com/watch?v=iy-QyjV8dsI

- Pixabay: https://pixabay.com/en/videos/work-space-meeting-startup-notebook-3132/

- Videvo: ‘’Hacker Glasses 02’’ https://www.videvo.net/video/hacker-glasses-02/4501/

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