dimens.io

sharp.dimens.io

Input - sharp

http://sharp.dimens.io/en/stable/api-input

Table of Contents ¶. Take a "snapshot" of the Sharp instance, returning a new instance. Cloned instances inherit the input of their parent instance. This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream. Fast access to image metadata without decoding any compressed image data. A Promises/A promise is returned when. Name of decoder used to decompress image data e.g. Number of pixels wide. Number of pixels high. Number of bands e.g. Const image = sha...

sharp.dimens.io

Installation - sharp

http://sharp.dimens.io/en/stable/install

C 11 compatible compiler such as gcc 4.8 , clang 3.0 or MSVC 2013. Libvips and its dependencies are fetched and stored within. This involves an automated HTTPS download of approximately 6.5MB. Most recent Linux-based operating systems with glibc running on x64 and ARMv6 CPUs should "just work", e.g.:. Debian 7, 8. Ubuntu 12.04, 14.04, 16.04. Fedora 23, 24. Amazon Linux 2016.03, 2016.09. File and that it can be located using. Pkg-config - modversion vips-cpp. You might need to set. Mac OS ¶. Node modules ...

sharp.dimens.io

Performance - sharp

http://sharp.dimens.io/en/stable/performance

Running the benchmark test. Test environment ¶. AWS EC2 eu-central-1 c4.xlarge. 4x E5-2666 v3 @ 2.90GHz). Ubuntu 16.04.1 LTS (HVM, SSD, 20161115, ami-82cf0aed). Nodejs v6.9.1. The contenders ¶. V0227 - Image processing in pure JavaScript. Bilinear interpolation only. V009 - Wrapper around CImg. Compiles outdated, insecure dependencies from source. V3514 - Whilst primarily a map renderer, Mapnik contains bitmap image utilities. V193 - Wrapper around libmagick , supports Buffers only. The task ¶.

sharp.dimens.io

Utilities - sharp

http://sharp.dimens.io/en/stable/api-utility

Table of Contents ¶. Gets, or when options are provided sets, the limits of. Operation cache. Existing entries in the cache will be trimmed after any change in limits. This method always returns cache statistics, useful for determining how much working memory is required for a particular task. Object with the following attributes, or Boolean where true uses default cache settings and false removes all caching. Is the maximum memory in MB to use for this cache (optional, default. Will reset to this default.

sharp.dimens.io

Image operations - sharp

http://sharp.dimens.io/en/stable/api-operation

Table of Contents ¶. Rotate the output image by either an explicit angle or auto-orient based on the EXIF. Use this method without angle to determine the angle from EXIF data. Mirroring is supported and may infer the use of a flip operation. Implies the removal of the EXIF. Tag, if any. Method order is important when both rotating and extracting regions, for example. Will produce a different result to. 0, 90, 180 or 270. (optional, default. Extract a region of the image. Before and after for both. Sharp(...

sharp.dimens.io

Resizing images - sharp

http://sharp.dimens.io/en/stable/api-resize

Table of Contents ¶. By default, the resized image is centre cropped to the exact size specified. Possible reduction kernels are:. Use a Catmull-Rom spline. Use a Lanczos kernel. Use a Lanczos kernel with. Possible enlargement interpolators are:. Use nearest neighbour interpolation. Faster than bicubic but with less smooth results. Use the smoother VSQBS interpolation. To prevent "staircasing" when enlarging. Which prevents some " acutance. But typically reduces performance by a factor of 2. Crop the res...

perf.rocks

Tools | Perf.Rocks

http://perf.rocks/tools

Analysis, optimization and monitoring tools including Grunt, Gulp and Broccoli plugins. BPG (Better Portable Graphics) is a new image format. Generates a website with perfromance metrics of your website from PageSpeed Insights and dev-perf. Auditing and performance metrics for Progressive Web Apps. The easiest way to measure your performance budget. SVG based HAR Waterfall Viewer. Optimize CSS delivery by checking for redundancy, validation errors, and following best practices. The percentages of Chrome ...

sharp.dimens.io

Constructor - sharp

http://sharp.dimens.io/en/stable/api-constructor

Table of Contents ¶. If present, can be a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or a String containing the path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file. JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when null or undefined. If present, is an Object with optional attributes. Integral number representing the DPI for vector images. (optional, default. Describes raw pixel image data. See. An EventEmitter that emits a.

sharp.dimens.io

Output - sharp

http://sharp.dimens.io/en/stable/api-output

Table of Contents ¶. Write output image data to a file. If an explicit output format is not selected, it will be inferred from the extension, with JPEG, PNG, WebP, TIFF, DZI, and libvips' V format supported. Note that raw pixel data is only supported for buffer output. A Promises/A promise is returned when. The path to write the image data to. Called on completion with two arguments. Contains the output image. When no callback is provided. If present, gets three arguments. Err, buffer, info). Optimise pr...