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Rasterisation

05:52, 08/04/2021

One day I was explaining lớn my co-worker how to use a Photopea software (a free, online version of Photoshop). She asked me to explain every tool & option, and after we tested each tool, we decided khổng lồ create together a sample project.She used Photoshop many years ago for fun, so it was more a “reminder” than a “how-to-use-this-software” course. I managed khổng lồ answer all questions but… I had trouble with explaining one of them – it was about the image rasterization.

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When you upload a pholớn khổng lồ the Photoshop và other graphics software, you can’t modify the photo until you rasterize it. I had a general idea of what rasterization is & why we have sầu to vì it, but I couldn’t explain it properly.

So I decided lớn gather here as many pieces of information about the rasterization as I can!

So, what does it mean to rasterize an image?

Rasterization is the act of converting an image described in a vector format(shapes) into lớn a raster image (pixels or dots) lớn display on a Clip device, print it or to save it in a bitmap tệp tin format.An inverse conversion is used occasionally. The most elementary algorithm of rasterizing the 3D scene takes it as a collection of polygons, and then it creates projections on 2D surfaces. Polygons are represented as a phối of triangles. Triangles are represented by three vertices in 3 chiều space. In the simplest terms, a rasterizing device (example: Photoshop) takes a stream of vertices, converts them inkhổng lồ according two-dimensional points, and fills in the interior color of the equivalent, two-dimensional triangles.

Rasterization is usually done for vector graphics or images containing vector components. Vector components can be text objects that have not yet been rasterized: letter shapes are vector images.

About files format:Examples of vector images: .ai, .eps.svg files.Examples of images that can contain vector elements are .pdf and .ps. InDesign files (.indd) are also combined with raster and vector elements, but .indd files are not intended for distribution lớn the printer or lớn such people: you can first export a copy of them .pdf.Examples of raster images are .tiff, .jpg, .exif, .rif, .gif, .bmp, .png.

TIP: Rasterization usually reduces the image khổng lồ one flat layer, thus limiting editing lớn a minimum. You will want khổng lồ keep the un-rasterized version of the tệp tin archived at all times so that you can make a correction later if necessary.

What’s the purpose of rasterizing?

Why we have sầu to rasterize an image? That’s because painting tools & paint filters cannot be applied khổng lồ layers/ images that contain vector data (e.g. text layers, shape layers, vector masks & intelligent objects) and generated data (e.g. fill layers). Therefore, khổng lồ be able khổng lồ use the entire arsenal of graphical editor tools, vector images must be rasterized.

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How to lớn rasterize a layer in Photoshop?

What does it mean lớn rasterize a layer? Here’s a quiông xã tutorial on how khổng lồ rasterize an image in photoshop


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Can you un rasterize in Photoshop?

Unfortunately, there’s no such option.If you accidentally rasterized your text, và now can’t edit it, unless your document is still open và you can undo the rasterization, I’m afraid you will have to re-create the text layer.

TIP: Instead of rasterizing your text/object, you should instead try converting the layer lớn a smart object. This can be done by selecting the layer on the Layers panel, và going to Layer > Smart Objects > Convert to Smart Object.It allows you khổng lồ apply filters & effects much like you would to a regular “raster” layer, but still lets you edit text by going to Layer > Smart Objects > Edit Contents with the smart object selected.

What is rasterize PDF?

Rasterize PDF re-creates the document using images of the pages instead of vector commands. It functions the same as exporting a PDF to lớn images và then re-importing the images inlớn a new PDF. After rasterizing the new document will be opened.

Who invented rasterization

In 1965, Bresensi developed the so-called Bresensi algorithm with a center point, working on integers, used lớn convert any segments, circles and ellipses; the algorithm has been implemented in hardware. The same applies lớn filling the surface – filling any polygons is complicated and expensive computationally, however, there are very effective algorithms for filling triangles và convex quadrants, which are implemented in hardware in 3 chiều accelerators.

What the difference between raster và vector images?

Vector images are images that are represented in a mathematical way. Thanks to lớn this, we have sầu a possibility lớn enlarge the picture to infinite precision. They are ideal in situations where the image can be used in various resolutions và dimensions.

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Raster graphics have sầu a fixed dimension, just lượt thích a grid pattern with specific values at each point. These graphics are the default for real-world things (IE, scanned images, photos, etc.). They are ideal for use when the image is used only once, & you never have lớn zoom in or when the part comes from a photo or other real-world image.


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