Re: how to cache images
Re: how to cache images
- Subject: Re: how to cache images
- From: Kyle Sluder <email@hidden>
- Date: Sat, 08 Jun 2013 18:57:39 -0700
On Jun 8, 2013, at 5:39 PM, "Gerriet M. Denkmann" <email@hidden> wrote:
>
> On 9 Jun 2013, at 06:23, Jens Alfke <email@hidden> wrote:
>
>>
>> On Jun 8, 2013, at 12:24 PM, Ken Thomases <email@hidden> wrote:
>>
>>> I haven't done the experiment, but I don't believe this is necessarily true. NSBitmapImageRep is documented (in the Snow Leopard release notes) as keeping the original image data and not re-encoding or exploding file sizes on being saved.
>>
>> I did not know this — guess I haven’t been reading the release notes closely enough.
>
> url = some/picture.gif
> NSDataReadingOptions mask = 0; // NSDataReadingUncached
> NSData *data = [ NSData dataWithContentsOfURL: url options: mask error: &outError ];
> got 19420 bytes
>
> NSImage *image = [ [ NSImage alloc ] initWithContentsOfURL: url ];
> BOOL ok = [ NSArchiver archiveRootObject: image toFile: @"/tmp/anImage" ];
> got 307559 bytes (NSKeyedArchiver adds another half kB)
>
> This 16-fold increase of data is - regardless of image quality - not acceptable for my purposes.
This is why you don't use NSArchiver for data blobs: it writes them out as Base64-encoded plist strings.
--Kyle Sluder
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