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资源说明：Image Transform Web Service
## SinMagick Web service to handle image transforms. http://blog.50projects.com/p/sinmagick-image-processing.html ## Setup * The following gems are required sinatra, rmagick, aws/s3 * Modify the config/settings.yml and config/sinmagick.yml file to represent your environment * Start using thin, rackup or mongrel (thin start -C config/sinmagick.yml) ## Usage * Point your web browser at http://[HOST]:[PORT]/. You should see a basic file upload form. An upload operation returns the file path. * Raw images can be accessed at http://[HOST]:[PORT]/[hash]/[filename]. * Transformed images can be accessed at http://[HOST]:[PORT]/transform/[transform]/[hash]/[filename]. See below for available transforms. * I highly recomend Varnish as a frontend for this web service. ## Transforms S - Scaling * h - height - int * w - width - int * example - Sw100_h100 R - Crop + Resize * h - height - int * w - width - int * g - gravity - (n,w,s,e,nw,sw,ne,se) * example - Rw100_h100_gnw A - Resize but maintain aspect ratio * h - height - int * w - width - int * example - Aw100_h100 C - Cropping * h - height - int * w - width - int * x - crop start - int * y - crop start - int * example - Cx0_y0_w100_h100 G - Crop using gravity * h - height - int * w - width - int * g - gravity - (n,w,s,e,nw,sw,ne,se) * example - Gw100_h100_gn O - Rotation * a - angle - int (1-359) * example - Oa90 B - Black and White * example - B P - Converts bloated PNGs to JPEGs * t - image density threshold - int (a good value is a 3. Image density is calculated as width*height/filesize) * example - Pt2 F - Changes File Formats * f - format - string (png,jpeg,gif) * example - Ffjpeg ## Compound Examples * Transforms are calculated left to right so order can be important. * Multiple transforms can be executed by using a hyphen (-). * example - http://[HOST]:[PORT]/transform/Aw100_h100-Oa90-Pt3/[hash]/[filename] (Resize to 100x100 while maintaining aspect ratio. Then rotate 90 degrees. Then convert to a JPEG if the file has an image density of more than 3) ## Storage Priority * Read_priority - Sets the order in which a configured storage item will be read from (int >1). If the priority is set to 0 it will be skipped. Two items should not have the same read priority as the service does not load balance reads. * Write_priority - Sets the order in which a configured storage item will be read from (int >1). If the priority is set to 0 it will be skipped. Two items may have the same write priority. If they do they will both be written to. This can be good for backups to s3 for example.
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