在上传到服务器之前，使用Canvas调整Iphone图片大小 [英] Using Canvas to resize Iphone images before uploading to server

问题描述

我们正在使用Canvas在上传到我们的服务器之前调整Iphone / IPAD上的图片。

We are using Canvas to resize images on Iphone/IPAD before uploading to our server.

在iPhone 4S和5上，当照片以横向模式相机，调整大小工作正常。在纵向模式下拍摄时，图像被压缩约1/4。但是，当使用后置摄像头拍摄时，所有的图像，包括风景和肖像，被压扁约7/8，只留下一个细腰带。

On IPhone 4S and 5, when photos are taken in landscape mode with FRONT camera, the resizing works fine. When taken in portrait mode, the images are squashed by about 1/4. But when taken with rear camera, all images, both landscape and portrait, are squashed by about 7/8, leaving just a thin belt to view.

在IPAD和IPOD ，对于前和后摄像头是相同的：风景图像是精细的，但肖像图像被挤压1/4。

On IPAD and IPOD, it is the same for front and rear camera: landscape images are fine, but portrait images are squashed by 1/4.

我们尝试了几种不同的调整大小算法，但结果是相同的结果。

We tried several different resizing algorithms, but ended up with the same results.

任何想法如何解决这个问题？

Any ideas how to solve this problem?

推荐答案

解决方案，适用于我在 HTML5 Canvas drawImage ratio bug iOS 。该解决方案通过stomita认证，并于2014年1月14日发布并编辑（我相信）bymbre和亚光灼伤。

Found a solution that works for me at HTML5 Canvas drawImage ratio bug iOS . The solution is accredited to stomita and posted and edited (I believe) by tombre and matt burns on 14 Jan 2014.

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