Make your lessons more visually striking and memorable, even in large classrooms. Multiple students can work together interactively at the same time with the class, increasing student engagement and driving collaborative learning. Styli and fingers can both be used in any combination, for quick and easy interactivity. Convert JPG/PNG to Webp, make your web faster! WebP file format is a new image format released by Google that stores both lossy and lossless compression formats in high-quality.

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If you want to give a little life to interactive (or not) elements, it’s always nice to have more tricks to manipulate images for nifty effects.

One of such ways is mapping a Texture on a special canvas instruction, that will distort your texture based on the position of its points.

[kivy.graphics.Mesh](http://kivy.org/docs/api-kivy.graphics.html#kivy.graphics.Mesh) is such an instruction, and it has a simple interface, if not 100% straightforward, you basically call it this way.

where all: x mean the horizontal coordinate of a point y mean the vertical coordinate of a point s mean the horizontal position of the texture attached to this point (between 0 and 1) v mean the vertical position of the texture attached to this point (between 0 and 1)

indices is useful if, for some (very good) reason, you don’t want to give the points in the order you’ll use them, or if you want to refer to a point multiple time (this won’t be demonstrated in this blog post, but try to think about a grid mapping, for example), now we will use it in the most simple way, just give the range of your number of points.

the texture needs to be a texture object, you can get such an object by getting the texture property of a [CoreImage](http://kivy.org/docs/api-kivy.core.image.html#kivy.core.image.Image) or an Image (or even a Label, if you want to).

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Let’s say we have an image, for example, kivy logo.

(this will work wherever you are, because kivy look at his images anyway :))

This image is a circle, lets use that to cut it into a virtual pie and assign a part of the texture to each part, we’ll be using the triangle_fan/tekken-6-zip-file-for-ppsspp.html. mode of Mesh, that is a perfect fit for such an operation.

put that in a more complete program, and you get this:

Now, this is not very impressive, we just have an image, there were much simpler ways to do that!

But now, we can tweek the rendering a lot, lets add some offseting of the texture, some radius change, and some wobbling, with sliders to control all this.

which gives us:

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Now we are talking!

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Image Size and Resolution

The coordinate system iOS uses to place content onscreen is based on measurements in points, which map to pixels in the display. A standard-resolution display has a 1:1 pixel density (or @1x), where one pixel is equal to one point. High-resolution displays have a higher pixel density, offering a scale factor of 2.0 or 3.0 (referred to as @2x and @3x). As a result, high-resolution displays demand images with more pixels.

For example, suppose you have a standard resolution (@1x) image that's 100px × 100px. The @2x version of this image would be 200px × 200px, and the @3x version would be 300px × 300px.

Supply high-resolution images for all artwork in your app, for all devices your app supports. Depending on the device, you accomplish this by multiplying the number of pixels in each image by a specific scale factor.

Designing High-Resolution Artwork

Use an 8px-by-8px grid. A grid keeps lines sharp and ensures that content is as crisp as possible at all sizes, requiring less retouching and sharpening. Snap the image boundaries to the grid to minimize half pixels and blurry details that can occur when scaling down.

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Produce artwork in the appropriate format. In general, use de-interlaced PNG files for bitmap/raster artwork. PNG supports transparency and, because it's lossless, compression artifacts don't blur important details or alter colors. /adobe-creative-suite-crack-torrent.html. It's a good choice for intricate artwork that requires effects like shading, textures, and highlights. Use JPEG for photos. Its compression algorithm usually produces smaller sizes than lossless formats and artifacts are harder to discern in photos. Photo-realistic app icons, however, look best as PNGs. Use PDF for glyphs and other flat, vector artwork that requires high-resolution scaling.

Use the 8-bit color palette for PNG graphics that don’t require full 24-bit color. Using an 8-bit color palette reduces file size without reducing image quality. This palette is not appropriate for photos.

Optimize JPEG files to find a balance between size and quality. Most JPEG files can be compressed without noticeable degradation of the resulting image. Even a small amount of compression can save significant disk space. Experiment with compression settings on each image to find the optimal value that yields an acceptable result.

Provide alternative text labels for images and icons. Alternative text labels aren’t visible onscreen, but they let VoiceOver audibly describe what's onscreen, making navigation easier for people with visual impairments.