what is resolution of photo taken by iPhone 4 camera?

问题

In specs,

iPhone 4 screen resolution & pixel density * iPhone 4 has a screen resolution of 960×640 pixels, which is twice that of the prior iPhone models

As we know, when we code like this,

CGImageRef screenImage = UIGetScreenImage();
CGRect fullRect = [[UIScreen mainScreen] applicationFrame];
CGImageRef saveCGImage = CGImageCreateWithImageInRect(screenImage, fullRect);

the saveCGImage will have size (320,480), my question is how about iPhone 4 ? Is that (640,960) ?

Another question is about black image in thumb view when you open Photo.app if coding like this,

CGImageRef screenImage = UIGetScreenImage();

CGImageRef saveCGImage = CGImageCreateWithImageInRect(screenImage, CGRectMake(0,0,320,460));  // please note, I used 460 instead of 480

The problem is that when open "Photo.app", in the thumb view, those images are view as black, when clicking it to see details, that is okay. Any solution for this issue now ?

Thanks for your time.

update questions:

When you invoke UIGetScreenImage() to capture screen in iPhone 4, is that also 320x480 ?

回答1:

From Falk Lumo:

iPhone 4 main camera:

5.0 Mpixels (2592 x 1936)

1/3.2" back-illuminated CMOS sensor

4:3 aspect ratio

35 mm film camera crop factor: 7.64

Low ISO 80 (or better)

3.85 mm lens focal length

f/2.8 lens aperture

Autofocus: tap to focus

Equivalent 35mm film camera and lens:

30 mm f/22

回答2:

Photo resolution taken by iOS devices,

iPhone 6/6+, iPhone 5/5S, iPhone 4S(8 MP) - 3264 x
2448 pixels
iPhone 4, iPad 3, iPodTouch(5 MP) - 2592 x 1936 pixels
iPhone 3GS(3.2 MP) - 2048 x 1536 pixels
iPhone 2G/3G(2 MP) - 1600 x 1200 pixels

来源：https://stackoverflow.com/questions/3270202/what-is-resolution-of-photo-taken-by-iphone-4-camera

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