RJ wrote:
> In article <>, says...
>> stuffthis wrote:
>>> "Nik Coughlin" <> wrote in message
>>> news:441621b4$...
>>>> stuffthis wrote:
>>>>> "Nik Coughlin" <> wrote in message
>>>>> news:44161780$...
>>>>>> stuffthis wrote:
>>>>>>> But yet digitalmax compress your photo's for you. You can prove
>>>>>>> this for yourself by using their photo upload software, when you
>>>>>>> go to upload the photo's you will see that the file size is a
>>>>>>> lot less than the original. Are they breaking some sort of law
>>>>>>> with this misleading practice?
>>>>>>
>>>>>> That doesn't necessarily prove that they are re-compressing, is
>>>>>> the compression visibly noticeable, ie jpeg artifacts?
>>>>>> Otherwise the file size is probably smaller not because they are
>>>>>> re-compressing your image, but because they are stripping out
>>>>>> the EXIF data, which can be quite big on some files.
>>>>>>
>>>>>
>>>>> Well if that is the case it would be in their best interest to
>>>>> explain that wouldn't it. They reduce your total file size by
>>>>> about 1/2, does this still fit with your theory?
>>>>
>>>> Not even close, unless the photos were quite low res or highly
>>>> compressed already. I did a couple of tests and removing EXIF data
>>>> knocked about 50k off a 450k file -- however the size of the EXIF
>>>> data will vary with different cameras and also depending on whether
>>>> you have picture organisers like Picasa adding metadata to them
>>>> (just as an example, for all I know Picasa keeps its own database
>>>> and doesn't make use of EXIF, I have no idea). But yeah, in that
>>>> case sounds like they are re-compressing.
>>>>
>>>
>>> The photos were straight from my 3.2 megapixel canon a75 camera,
>>> resolution was set to highest and compression to lowest, the camera
>>> outputs jpeg images so compressing them again as digitalmax do is
>>> bad.
>>
>> I'd go along with that. I was thinking, it may be that the software
>> is smart enough to use a level of compression that, while being
>> higher than the original, is still low enough to be completely
>> unnoticable at the targeted print size. Even that is problematic
>> because some photos don't compress anywhere near as nicely as
>> others, so even if they got away with it most of the time some
>> photos (maybe only a small minority) would almost certainly look
>> worse.
>
> I don't use their software, it wouldn't work properly on my PC
You mean because you're not running Windows, or that you met the
requirements but it still didn't work? I didn't use it either. I tried but
all I wanted to do was check the size of the uploaded file and it wanted a
credit card number to place the order with before I was allowed to upload
the file, whereas on the website it didn't.