Sharpen after export?

Hello Experts!
I'm thinking about the optimal workflow when sharpen an image: the sharpen-step should be one of the last steps when developing/optimize an image (raw or jpg or ...). And - it should consider the size of an image (...size of pixels...) or in other words: the size (and paper...) of the image-print.
That's right - or?
Does this realy mean, that the sharpen-step should be done AFTER an export of an image? The target size of the image is (only?)defined in the export-dialog. Then it would be nescessary to import the "exported" first and than starting the sharpen-process.
Is there a better way?
Thx,
Rudi

well - but this "works" on the whole picture and it's a very "simple" way - "simple" means: ther're only 3 items to do the sharpen.
In most cases i use
a) first smooth sharpen of the whole image and than the
b) selectiv sharpen with the control-brush
And especially in the second step i would prefer considering the (output-)size of the image.
Any other ideas?

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ah I see, well the freeze frame is just taking one field of your material (half the resolution as its interlaced not progressive) and inventing the other half to make up the rest of the information so I'm not surprised its looking blurry on output, the reason you're not seeing it before on your screen is that you never see full res on the canvas until you output unless you use a third party output device like Matrox or Aja.
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Output sharpening on export

I wonder if there is a way to specify an amount of sharpening that shall be applied to an exported image that is going to be scaled down e.g. for web presentation. My preferred solution would be to include this into an export preset.
I have used this "output sharpening" feature (also known as "web sharpening") within the export preset e.g. in Bibble Pro 5 (yes, another RAW converting software) and it really helps avoiding loss of sharpness as a result of scaling down images. I agree that this is not necessarily needed for each and every image but there are quiet some cases when output sharpening gives them some punch.
As a newbie to Aperture this is what I have learned so far:
Aperture provides various tools to adjust sharpening of images, starting with the sharpening adjustment applied to RAW files (RAW fine tuning) continued by "Sharpen", "Edge Sharpen" up to the possibility to "brush in" sharpening to certain parts of an image.
Apple was so kind as to provide a nice introductory movie clip to illustrate the basic usage of edge sharpening
All these adjustments are applied to the image in its original size of course. As soon as I export images and downsize them (using an appropriate preset) I do not seem to have any influence on how post-processing continues (re: sharpening). I have to rely on how Aperture handles this internally (right?). Surprisingly, this is different when it comes to printing. If the output is print the user may adjust the amount of "output sharpening".
As far as I have seen I am not the first and only one who faces this issue. A more elaborate article on output sharpening with sample images in context with Aperture is given e.g. here.
Another interesting review on "Sharpening with Aperture 3" can be found here.
Of course I have also searched the forums for a suitable solution. As far as I can see a satisfactory solution has not been outlined so far:
Sharpening upon jpeg export
Sharpening export workflow question
Output sharpening
Sharpening during exporting process
Maybe there are some news or workarounds in the meantime. I'd appreciate your proposals and look forward sharing your experience on this issue.

Kirby, I thank you for your kind answer. It is very much appreciated!
After reading one of the articles quoted in my original post I thought that the "BorderFX solution" for output sharpening on export would no longer work. But it obviously does as you report.
In the meantime I have had a look at the BorderFX website. Many features for a plugin - more than I usually need - but an interesting project anyway!
As you supposed I am not that keen on using a plugin for just the sharpening of images going to the web. But it's at least a workaround which I think is worth while a try.
So let's have a try!
For anyone having a similar problem I attach two sample images which I exported
a) with the built-in export feature of Aperture (3.2)
b) with BorderFX (1.5.3) and the settings you recommended
Please be sure to click on the respective images as the previews look horrible to me at first sight!
a) Aperture Export (resize to 600 px height)
b) BorderFX export (resize to 600 px height, Edge Sharpen: Intensity: 0.5, Radius 1.00)
The image size allowed to upload here is quit limited, but I think the difference can be noticed. Maybe the sharpening in b) is already overdone but the comparison shall only serve as a first shot.
If somebody from the Apple Aperture team comes across this thread:
Maybe we can have a "sharpen on export setting" right within Aperture one day?
This is what e.g. Bibble offers in this respect:
In this case post processing is similar to an unsharpen mask filter setting.
I edited my message after I have seen the artifacts appearing in the preview images.

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For now, I am using the Border FX plug-in which has some kind of output sharpening tool. The pictures come out much better and look more like the edited version in Aperture.
I am very frustrated with this though, I am sure there is a way to use the original Aperture export without losing any quality.
Here are some pics that hopefully show what I'm talking about
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second one is the picture exported with Aperture
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http://en.wikipedia.org/wiki/Srgb
http://en.wikipedia.org/wiki/Rec._709
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Sharpen after export?

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