Image Server
An image server toolkit in Go (Golang)
Features
- HTTP server
- Resize (GIFT, nfnt resize, Graphicsmagick)
- Rotate
- Crop
- Convert (JPEG, GIF (animated), PNG , BMP, TIFF, ...)
- Cache (groupcache, Redis, Memcache, in memory)
- Gamma correction
- Fully modular
Examples
Demos
These demos use the "advanced" example.
Click the images to see the URL parameters.
Resize
| Options | Result |
|---|---|
width=200(preserve aspect ratio) |
 |
height=200(preserve aspect ratio) |
 |
width=200&height=200(change aspect ratio) |
 |
width=200&height=200&mode=fit(fit in 200x200) |
 |
width=200&height=200&mode=fill(fill 200x200 and crop) |
 |
Rotate
| Options | Result |
|---|---|
rotation=90(counterclockwise) |
 |
rotation=45&background=ffaa88(background) |
 |
Crop
Format: min_x,min_y|max_x,max_y
| Options | Result |
|---|---|
crop=556,111|2156,1711 |
 |
crop=956,511|1756,1311 |
 |
crop=1252,799|1460,1022 |
 |
Animated GIF
| Original | Resized |
|---|---|
| Animated |  |
| Spaceship |  |
Gamma correction (more info)
| Original | Disabled | Enabled |
|---|---|---|
| Dalai Gamma |  |
 |
| Gray squares |  |
 |
| Random |  |
 |
| Rings |  |
 |
| Rules / sucks |  |
 |
Resampling
| Resampling | Rings | Large |
|---|---|---|
| Nearest neighbor |  |
 |
| Box |  |
 |
| Linear |  |
 |
| Cubic |  |
 |
| Lanczos |  |
 |
Quality
| JPEG quality | Result |
|---|---|
| 5% |  |
| 10% |  |
| 50% |  |
Convert (JPEG to GIF)
Backward compatibility
There is no backward compatibility promises. If you want to use it, vendor it. It's always OK to change things to make things better. The API is not 100% correct in the first commit.