> -----Original Message----- > From: Robert Cummings [mailto:[EMAIL PROTECTED] > Sent: Wednesday, October 01, 2008 11:54 AM > To: Maciek Sokolewicz > Cc: [EMAIL PROTECTED]; php-general@lists.php.net > Subject: Re: [PHP] Re: photo file size > > On Wed, 2008-10-01 at 18:34 +0200, Maciek Sokolewicz wrote: > > elk dolk wrote: > > > > > > > > > > > > Hi All, > > > > > > I have some photos with different file sizes like 100KB 125KB > 200KB ,… > > > I want to shrink them and reduce the > > > file size to Max 60KB without sacrificing image > > > quality and size! > > > > Without sacrificing size AND quality? So you don't want to lose > enough > > data to get to a max 60KB amount, without actually losing data... > wow, > > that won't be easy; or even better, it will probably not even be > > possible. > > Maybe he has uncompressed bitmaps (yeah I know it's unlikely :) > > > Changing formats makes the size smaller, but always loses some > > detail/modifies the image slightly (eg. from bmp to png loses alot of > > data, but unfortunately also some (little) quality). > > > > So, decide which you want to sacrifice, and do it. > > Depedning on how his files are stored, he may get some extra > compression > out of a PNG by upping the compression factor without quality > degradation. If he has uncompressed bitmaps he will benefit greatly. I > think I've found alos that jpg compresses better than gif (with 100% > quality setting). Beyond that a 5 to 10% quality loss on jpg is often > minimally adverse to the the visibility but strongly depends on what > kind of detail is in the picture.
I was under the impression that .png files were "lossless"? Maybe I'm wrong... but the .png files I manipulate in a few of my projects are almost always larger than their other-format counterparts. I've only used .png in the past when transparency and lossless-ness (a new word!) are factors. > > > PHP should have a solution for reducing the size of files in > Batch. > > it does, it's called writing a function and calling it for each of > the > > files in the batch. Todd Boyd Web Programmer
