2014/10/15 下午 10:11:11

iphone Programming Glossary: lossy

UIImageWriteToSavedPhotosAlbum save as PNG with transparency?

http://stackoverflow.com/questions/1489250/uiimagewritetosavedphotosalbum-save-as-png-with-transparency

that you can email it save it in a database etc. You just can't get it into the photo album for now unless it is a lossy non transparent JPG. iphone uiimage quartz graphics share improve this question This is a problem I have noticed before.. at Apple Bug Report . If more people report this issue it is more likely that Apple will fix this method to output non lossy alpha capable PNG. EDIT If you can compose your image in memory I think something like the following would work or at least..

iPhone - get number of days between two dates

http://stackoverflow.com/questions/3075356/iphone-get-number-of-days-between-two-dates

nsdatecomponents share improve this question From the docs for components fromDate toDate options The result is lossy if there is not a small enough unit requested to hold the full precision of the difference. Since the difference is less..

When to use PNG or JPG in iPhone development?

http://stackoverflow.com/questions/3929281/when-to-use-png-or-jpg-in-iphone-development

which format to use and in which case iphone ios png jpeg share improve this question PNG's are pixel perfect non lossy and require very little extra CPU energy to display. However large PNGs may take longer to read from storage than more compressed.. to read from storage than more compressed image formats and thus be slower to display. JPG's are smaller to store but lossy amount depends on compression level and to display them requires a much more complicated decoding algorithm. But the typical..

Usage of NSException in iPhone Apps

http://stackoverflow.com/questions/4310560/usage-of-nsexception-in-iphone-apps

the behavior is undefined system code may or may not leave your application in an undefined potentially crashy or data lossy state. Or more strongly You can't throw an exception in your code 2 with the expectation that you can catch and handle it..

PVR textures versus PNG in OpenGL ES

http://stackoverflow.com/questions/501956/pvr-textures-versus-png-in-opengl-es

the PVRTexTool better iphone opengl es share improve this question PNGs High precision color representation not lossy Slow decompression from disk. Slow uploading to graphics hardware internal pixel reordering is performed by drivers. Slower.. for photorealistic ones. Can be exported from any image editing software directly and quickly. PVRs Low precision lossy compression 2 levels blocky no sharp edges and smooth gradients. Image quality varies with content. 2 bit and 4 bit compression..

NSString - how to go from “ÁlgeBra” to “Algebra”

http://stackoverflow.com/questions/5050270/nsstring-how-to-go-from-lgebra-to-algebra

as well. You can go through a series of steps original string NSString str @ lgeBra convert to a data object using a lossy conversion to ASCII NSData asciiEncoded str dataUsingEncoding NSASCIIStringEncoding allowLossyConversion YES take the data.. dataUsingEncoding NSASCIIStringEncoding allowLossyConversion YES take the data object and recreate a string using the lossy conversion NSString other NSString alloc initWithData asciiEncoded encoding NSASCIIStringEncoding relinquish ownership..