#Crop in fast image resizer windows#

If you have visitors farther than ~600 miles away from your server, you can further improve their experience with edge caching. Good for preventing XSS attacks from untrusted image sources. Process=Always - Forces re-encoding of the image, even if no other operations are requested.Process=Default - Processes the image only if one of the defined querystring commands are being used.Useful if you want to cache but not process an image Process=No - Prevents the requested image from being modified.Cache=Always - Forces the current image request to be disk cached, even if the image isn't modified.Cache=Default - Caches the image if it is processed, doesn't cache the image if it's served unmodified.Cache=No - Prevents the current request from being disk cached.The DiskCache plugin requires you to use the URL API ( read why). It easily scales to 100,000 variants and can be used with as many as a million images. The DiskCache plugin improves the throughput 100-10,000X by delegating the serving of the cached files back to IIS and by utilizing a hash-tree disk structure. Since it requires contiguous, non-paged, non-fragmented RAM, it can't be used as a (D)DOS attack vector, but it does mean that there is a RAM-based limit on how many concurrent image processing requests can be handled. This module is extremely fast, but decoding the original image requires a large amount of contiguous RAM (usually 50-100MB) to be available. Disk Caching - why you need itĮvery public-facing website needs disk caching for their dynamically resized images (no, ASP.NET's output cache won't work). Setting them to the width/height of the display image allows you to crop in display coordinates, without needing to know the original size of the image. Setting them to 100 allows you to crop by percentage. In addition, you can specify cropxunits and cropyunits. crop=10,10,-10,-10 removes 10 pixels from all edges of the image. This allows easy trimming without knowing the size of the image.įor example, crop=0,0,0,0 leaves the image uncropped. If X2 or Y2 are 0 or less, they are relative to the bottom-right corner. The coordinates are relative to the top-left corner of the original image - if they are positive values. The URL syntax for cropping is &crop=x1,y1,x2,y2. With PrettyGifsĢ56: Without PrettyGifs, on Server 2008 and aboveĢ56 colors (You cannot adjust compression): Without PrettyGifs, on Server 2003 and belowĢ56 colors (You cannot adjust compression): Background colorĭislike white? Transparent padding is added (when required) for PNGs and GIFs, but jpegs don't support transparency.Īdd bgcolor=name or bgcolor=33ddff to set the background (matte) color. Only 32-bit PNG files are supported by default.Īdjusting compression in GIF files happens by setting the colors=2.256 command. If you want to generate 8-bit PNG files, you'll also need the PrettyGifs plugin. You'll also need the AnimatedGifs plugin if you're using those.

#Crop in fast image resizer windows#

Windows support for GIF files isn't as efficient. You need the PrettyGifs plugin to get acceptable GIF quality, adjust compression, or even support transparency. The default is 90, an excellent tradeoff between size and perfection. By default, the original format (or the closest match) is used however, you can convert any format file to any other file, maintaining transparency, IF the PrettyGifs plugin is installed.Īdjust jpeg compression with the quality=0.100 command. Set format=jpg, format=gif, or format=png to force a particular output format. Scale=canvas, bgcolor=gray, Anchor=Topleft: Formats & compression Valid values are topleft, topcenter, topright, middleleft, middlecenter, middleright, bottomleft, bottomcenter, and bottomright. So, you don't like images being centered when you use mode=crop, mode=pad, or scale=canvas? You can pick the alignment type with the anchor command. You can change the default behavior from scale=down to something else with the DefaultSettings plugin. Here we attempt to upscale an image using scale=down, scale=both, and scale=canvas respectively. The image never gets upscaled, but the canvas is expanded to fill the desired area. Image enlargement causes blurriness and should be avoided. To allow both reduction and enlargement, use scale=both. Scale=down|both|canvasīy default, images are not enlarged - the image stays its original size if you request a larger size. Note: mode=carve requires the SeamCarving plugin. If only width or height is specified, aspect ratio is maintained. How those bounds are interpreted is determined by the mode command.

You can set bounds for an image with the width and/or height commands.