> One word of caution: don't try to resize to a larger pixel
measurement.
> If the person gives you a hi-res 4"x6" image (1200x1800), don't try
to make
> that into a hi-res 8"x10" (2400x3000). If you do, you'll be
> inventing pixels from thin air and it won't look good.
Yes...you can go down but not up...
Everything makes complete sense, now that resampling is taken into
consideration.
The only time an image needs to be resampled, is when it's being prepared
for
onscreen display to reduce file size...
Looks like CFX_ImageCR will do everything I need, including resizing only
with width
specified and heighth automatically calculated, resizing and creating the
various files
according to needed print dimensions, and the ability to resample an image
to reduce
the file size...and all with great quality...
I'm going to be doing some of this work for a professional photographer who
will be
very concerned about image quality, and it looks like Efflare pays special
attention to that.
Rick
> -----Original Message-----
> From: Kevin Graeme [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 11, 2003 2:14 PM
> To: CF-Talk
> Subject: Re: Image manipulation
>
>
> Okay, to get the tags to work for you, you're going to have
> to give up
> thinking in terms of 8x10 and 5x7. At least for a part of
> the process.
>
> When you say "hi-res 8x10", you have to clarify what that
> means in pixel
> values. If "hi-res" = 300dpi to you, then a bit of simple
> math will give you
> the pixel values.
>
> 8"*300dpi = 2400pixels
> 10"*300dpi = 3000pixels
>
> Therefore,
>
> Hi-res 8x10 = 2400x3000 pixels
>
> From that, you want to get a hi-res (300dpi) 4x6.
>
> 4*300 = 1200px
> 6*300 = 1800px
>
> So all you need to do is tell the image manipulation tag
> that you want to
> resize that image to 1200*1800. And as you've seen, some
> tags allow you to
> just specify one dimension and the other resizes proportionately.
>
> To size for the screen, you probably already know the desired pixel
> measurements (or at least width) for your web thumbnail and
> preview, so you
> just plug that in.
>
> One word of caution: don't try to resize to a larger pixel
> measurement. If
> the person gives you a hi-res 4"x6" image (1200x1800), don't
> try to make
> that into a hi-res 8"x10" (2400x3000). If you do, you'll be
> inventing pixels
> from thin air and it won't look good.
>
> Hope that helps and good luck,
>
> -Kevin
>
>
> ----- Original Message -----
> From: "Rick Faircloth" <[EMAIL PROTECTED]>
> To: "CF-Talk" <[EMAIL PROTECTED]>
> Sent: Thursday, September 11, 2003 12:12 PM
> Subject: RE: Image manipulation
>
>
> > It was the resampling that was complicating the
> discussion...my bad...
> >
> > But that brings me back to my original question about the CF image
> > manipulation tags. I want to be able to automatically
> resample the images
> > for display so the file size is smaller while keeping the
> originals (if
> they
> > are
> > scanned or taken at higher resolutions) at the same ppi.
> >
> > I don't know yet whether or not any of the tags will perform that
> function.
> >
> > I want to be able to upload a hi-res 8x10 image, have it downsized
> > (dimensions only)
> > to a 5x7 and 4x6 (still at same ppi, if the camera's ppi setting is
> > variable)
> > then resample the image to 72 ppi for display on the
> website. The 8x10,
> > 5x7, and 4x6
> > are for downloading, saving, and printing...that's what
> I'm trying to
> > accomplish.
> >
> > Anyone know what tag can do this? CFX_Image?
> CF_MagickTag/ImageMagick?
> > CFX_ImageCR from Efflare?
> >
> > If CFX_ImageCR can accomplish all of that... ppi manipulation and
> > resampling, too,
> > then it'll be worth $149, easily...
> >
> > Thanks for your help...
> >
> > Rick
> >
> >
> > > -----Original Message-----
> > > From: Claude Schneegans [mailto:[EMAIL PROTECTED]
> > > Sent: Thursday, September 11, 2003 12:32 PM
> > > To: CF-Talk
> > > Subject: Re: Image manipulation
> > >
> > >
> > > >>Can't agree there...perhaps we're comparing
> apples to oranges...
> > >
> > > Excatly: you are comparing two different images!
> > >
> > > >>Took the same photo and resampled it to 72 pixels
> per inch (ppi),
> > > 360 pixels wide, and 503 pixels high. (Maximum quality JPEG
> setting)
> > >
> > > When you "resample" an image this way you get a
> different image.
> > > You say yourself one is "1501 pixels wide", the other one is
> > > 360 pixels.
> > > Of course, if you print them at the same size, thay won't
> > > look the same.
> > > Here are your apples and oranges.
> > >
> > > >>I'm not sure if we're missing something in this
> discussion,
> > >
> > > I'm pretty sure I'm not ;-)
> > >
> > > >>Does using "ppi" as opposed to "dpi" to refer to
> > > resolution make any difference in our discussion?
> > >
> > > If you see a difference between a pixel and a dot, yes it
> > > could make a difference, but for me it doesn't.
> > >
> > >
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