IOS image Compression

In fact, picture compression, not just for iOS platforms, what I want to say here is that picture compression is actually two concepts

1, "pressure" to a picture from 10M to 200K, but his size does not change, the picture quality may fall a lot.

2, "shrink" the size of a picture from the 1024x1024, shrunk to 100x100, at this time his size has become smaller, like the number of smaller, the file size has become smaller.

On the iOS platform, there are two ready-made APIs for use, 1 and 2, respectively.

1 is uiimagejpegrepresentation (self. Photo, 1.0);

2 is [UIImage drawinrect:cgrectmake (0,0,targetwidth, targetheight)]

Therefore, these two combined to meet demand, pressure + shrinkage, the quality can not be too poor, but the volume is smaller, the size is also within the acceptable range.

IOS image Compression