无压缩 | jpeg压缩 | 无损二元包装 | 仅JPEG压缩时有效 | 平化类型(指定字符串中存储什么类型的数据) | |||
None | JPEG | PACKED BINARY | Quality | Image | Image and version information | reference to image | 字节长度 |
1 | 750 | 1 | 127549 | ||||
1 | 750 | 1 | 33647 | ||||
1 | 750 | 1 | 33647 | ||||
1 | 750 | 1 | 69 | ||||
1 | 400 | 1 | 19536 | ||||
1 | 1 | 38629 |
由表格可知一般设置jpeg压缩,Image and version information;