Questions JPG's format show on ios device

cocos2d-x C++
#1

wile i use jpg on my game development,on itouch(ios verson is 4.3.3) the jpg is very dark, but ion ipad (ios is 5.1.1) no problem, on Android is no problem.

so ,why?

please tip for me .thanks very much!

#2

I don’t know what can cause this but why use jpg? There are better formats.

#3

Using jpeg can be useful though, like in cases where you would want to show pictures of real things. You can save file size dramatically from not using lossless formats.
I don’t know what can cause this either, but it’s always a good idea to run it through an optimizer to remove all the garbage data that you don’t really need like exif and stuff.

#4

Leszek X wrote:

I don’t know what can cause this but why use jpg? There are better formats.

well, thanks for your tips,i will change my image format

#5

Justin Godesky wrote:

Using jpeg can be useful though, like in cases where you would want to show pictures of real things. You can save file size dramatically from not using lossless formats.
I don’t know what can cause this either, but it’s always a good idea to run it through an optimizer to remove all the garbage data that you don’t really need like exif and stuff.

thanks every much ,