Re: Converting JPEG Image Greater Than 72dpi To 72dpi
Re: Converting JPEG Image Greater Than 72dpi To 72dpi
- Subject: Re: Converting JPEG Image Greater Than 72dpi To 72dpi
- From: j o a r <email@hidden>
- Date: Thu, 25 Aug 2005 16:39:30 +0200
On 25 aug 2005, at 16.21, glenn andreas wrote:
What I really need is a way to take a high resolution image and
convert it into 72dpi while maintaining the same size and without
losing any quality.
Do I ask too much? Thanks.
Yes, you do.
If you convert from a higher resolution to a lower resolution you
loose data.
Consider a 10" x 10" image at 300 dpi - it contains 3000 x 3000
pixels. Coverted to 72 dpi results in an image 720 x 720 pixels.
You now have fewer pixels and as a result you will have a loss of
quality/data (for example, a 1 pixel wide line in the original
image either becomes a 0 pixel wide line which vanishes, or blurs
with the adjacent pixels, giving you a blur instead of a line).
In a way it depends. Let's say that you have that large 300 dpi image
displayed on a 72 dpi device sized to 100x100 device pixels. You
could probably convert that image to a 72 dpi image and display it
with the same device pixel dimensions without *visible* loss of
quality. Perhaps that's what the OP was asking for?
j o a r
Attachment:
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden