Test: micro-circle of friends that made most clear-app, circle of friends-IT information

Regular brush circle of friends you find, some photos are always very clear, and they blur the photos uploaded, and what the hell is it? Of course, it's certainly not because someone else filling QQ coins launched members, the root cause of this phenomenon is that you upload picture formatting problems.

Netizen Liu Jianliang by analyzing your code found in app upload pictures in GIF format can hardly be compressed, jpg and PNG format images to upload to your circle of friends will be forced to compress.

In this regard, Liu specifically verify uploaded pictures in three different formats:

? The first 900*500 (upload), highest jpg quality

? Second 900*500 (upload), PNG format

? Third 900*500 (upload), GIF format

By comparing the three pictures found that the clarity of the text can be seen on the right comparison, jpg and PNG Word some swear falsely, while GIF's sharpness is very high. Dahon's logo on a car bumper, but apparently found most clearly in the GIF format. There is, when you open a jpg or PNG images, you can see the effects of the original image. In fact, when the jpg or PNG map to the app when the background, will be compressed to 640px wide, GIF does not.

In other words, despite the upload 900x500 pictures, jpg, and PNG is compressed to a 640x356 resolution, GIF picture remains at 900x500.

Moreover, for JPG or PNG images, larger size and has not significantly improved picture clarity, GIF image larger, higher clarity .

Of course, the format of GIF is not perfect because the GIF supports up to 256 colors, when the picture when the colors are too rich, saved in GIF format color distortion.

So the final conclusion is:

1, if you insert a picture in the article, 900px wide enough.

2, If you want the text in the picture clearer, please save as a GIF picture formats, and image width as large as possible .

实测：微信朋友圈这样发图最清晰 - 微信,朋友圈 - IT资讯

经常刷朋友圈的你是否发现，有些人发的照片总是非常清晰，而自己发的照片一上传就变模糊，这到底是回事呢？当然，这肯定不是因为别人充了QQ币开通了会员，造成这种现象的根本原因在于，你上传的照片格式存在问题。

网友刘健亮通过分析代码发现，在微信里上传GIF格式的图片几乎不会被压缩，而jpg和png格式的图片在上传到朋友圈后都会被强制压缩。

对此，刘同学专门上传了三种不同格式的图片进行验证：

▲第一张900*500（上传时），jpg最高品质

▲第二张900*500（上传时），png格式

▲第三张900*500（上传时），GIF格式

通过对比三张图片发现，右边文字的清晰度比较能看出来对比，jpg和png的字边有些发虚，而GIF的锐度很高。再看车杠上dahon的logo，可明显发现GIF格式的最清晰。还有就是，当你点开jpg或png图片，就可以查看原图的效果。实际上，当jpg或png大图传到微信后台时，会被压缩到640px宽，而GIF不会。

也就是说，尽管上传的都是900x500照片，jpg和png都会被压缩到640x356分辨率，而GIF图片依然保持在900x500。

而且，对于jpg或png图片，更大的尺寸并没有明显改善图片清晰度，而GIF图片越大，清晰度越高。

当然，GIF也不是最完美的格式，因为GIF最多支持256种颜色，当画面色彩过于丰富时，保存为GIF格式色彩会失真。

所以最后的结论是：

1、如果文章中插入图片的话，900px的宽度就够了。

2、如果想让图片里的文字更清晰的话，请把图片另存为GIF格式，并且图片宽度尽可能大。