- Source: 9-slice scaling
9-slice scaling (also known as Scale 9 grid, 9-slicing or 9-patch) is a 2D image resizing technique to proportionally scale an image by splitting it in a grid of nine parts.
The key idea is to prevent image scaling distortion by protecting the pixels defined in 4 parts (corners) of the image and scaling or repeating the pixels in the other 5 parts.
A variation of the concept, the 3-slice scaling, consists in a grid of 3 parts in which only the pixels in 2 parts (the edges) are protected and the pixels on the middle part are repeated.
History and use
The concept was first introduced in a consumer application by Macromedia in Flash 8 (2005). and it was available as feature to scale symbols. Later on, in 2007 Adobe introduced it as a feature in Adobe Fireworks CS3, Adobe Illustrator, and Adobe Flash. Today it is also present as a feature of game development software like Unreal Engine, Bevy, Urho3D, and Unity 3D.
The technique can be used to manipulate both bitmap/raster graphics and vector graphics. A current implementation of the 9-slice technique is present on the CSS 3 Backgrounds and Borders spec by using the border-image property.
27-slice scaling
The concept used in 9-slice scaling can be extended to 3D, which enables a more natural way of scaling certain 3D meshes. The number 27 is derived by splitting a cuboid into 3 sections on all 3 axes.
The general method of scaling remains the same, whereby the 8 corners of the cuboid do not scale, similar to the 4 corners present in 9-slice scaling. The central core scales in 3 dimensions. The 6 faces of the cuboid scale in 2 dimensions. The remaining 12 edge pieces scale in 1 dimension. All of which are relative to the actual scaling applied.
A functional implementation is done in Unity as a downloadable package.
References
Kata Kunci Pencarian:
- Adobe Photoshop
- 9-slice scaling
- Nine patch
- Adobe Fireworks
- Slice sampling
- Pizzeria
- Advanced Video Coding
- Wafer (electronics)
- CT scan
- Kitchen knife
- 3D Slicer
