Hi Paul
right that is what I thought BUT I took an image down from 300 ppi and made it 72.
then uploaded new images on carousel and the quality is bad and faded, so I clicked resample and there was no difference., I do know photoshop well enough.
so I am done with that theory
thx
freewaytalk mailing list
email@hidden
Update your subscriptions at:
http://freewaytalk.net/person/options
Photoshop and Freeway use different techniques to resample images. You may be attributing the “sharpness” of your 300ppi originals to something besides the simple math of making large images smaller.
If you scale an image in Freeway, on output, Freeway uses a technique called bilinear interpolation to compute a new grid of pixels at 72ppi to approximate a (percentage scaled) copy of the original 300ppi grid. This copy is saved as a new image and output with the rest of your site.
If you started with a 300ppi image that was 2" square, it would be 600 pixels square. If you placed that image on the page in Freeway, then enlarged it to 3" square, and publish or preview, you will end up with a 72ppi image that is 3" square, or 216px square. Because you are resizing down using bilinear interpolation, you get a natural sharpening of the boundaries between tonal values.
To duplicate what’s going on in this process using Photoshop, you would need to open your image, use Image / Resize and either set the new dimensions to 216px square or 72ppi at 166% size. Either one would work.
Photoshop’s default resampling method is called bicubic interpolation, and it results in a slightly “softer” image with finer detail when resizing an image downward. It’s important to also apply some unsharp masking after such a resize (Filter / Sharpen / Unsharp Mask – the default values of 50% and 1px radius are fine for this purpose).
If you noticed a change in color, perhaps the process of resampling the image also included a step of removing the ColorSync profile from the original image. Freeway uses and respects these profiles, and Photoshop allows you to disregard them or strip them out of the final photo when you save.
Walter
freewaytalk mailing list
email@hidden
Update your subscriptions at:
http://freewaytalk.net/person/options
One last note about this. Photoshop allows you to change the pixel density (ppi) without actually resampling the image. When you do this (and it’s tremendously fast, even on very large images) you’re not actually editing the image at all. All you are doing is changing the “headers” at the beginning of the image file that tell the computer what resolution the image is saved at. Your 2" square 300ppi image (600px square) is also an 8.3" square image at 72ppi – and it’s still 600px square. Making this type of change in Photoshop will not affect anything in Freeway (unless by saving you also strip off the ColorSync profile, as noted above) because Freeway allows you to scale that 8.3 inch image down to fit in your 3 inch layout. The exact same pixels are involved in either case, and there would be no improvement or difference in the output.
Walter
freewaytalk mailing list
email@hidden
Update your subscriptions at:
http://freewaytalk.net/person/options
Hi guys
not to be a pain or anything but why is a jpeg option in Inspector. And it is always checked automatically
no matter what image is imported
thanks
C
freewaytalk mailing list
email@hidden
Update your subscriptions at:
http://freewaytalk.net/person/options
On 28 May 2009, at 17:01, Carla wrote:
not to be a pain or anything but why is a jpeg option in Inspector.
And it is always checked automatically
no matter what image is imported
Because you want your output to be a JPEG. Freeway will ‘detect’ what
kind of picture you’re importing, and set it to JPEG if it’s a
photograph or GIF if it’s got limited flat colours. The Inspector
thing is just there in case you want to override it (Freeway sometimes
guesses wrong).
best wishes,
Paul Bradforth
freewaytalk mailing list
email@hidden
Update your subscriptions at:
http://freewaytalk.net/person/options
Well thank you Paul
C
freewaytalk mailing list
email@hidden
Update your subscriptions at:
http://freewaytalk.net/person/options