Necessary to sharpen, again?

Hi
I have a few images I would like to enter into a contest. The images I'm choosing have already been cropped, edited, sharpened and printed. Before printing I make sure the resolution is high enough, close to 300.

Now, to prepare these images to be uploaded to the contest website, I have to resize the pixel dimensions and bump up the resolution. I have been turning on all 3 checkmarks when changing the resolution to 300, and choosing Bicubic Smoother.

After all the resizing and bumping up the resolution, is it necessary to sharpen the images AGAIN in Unsharp Mask?

Thanks,
Ruth

In truth, you shouldn't have sharpened the first time. Sharpening is very specific to size, so it should be the ABSOLUTE last step in your workflow.
Keep your original image un-sharpened, and when you're ready to output it - to print, or web, or whatever - sharpen it specifically for that size.

Damo77
Sharpening is my last step. The images I would like to use for the contest have already been sharpened for printing. Now I would like to use them for a contest. If I start from the original, it means I have to re-do all the editing again, as I flattened the image before printing it. Since I"m not sure if the images sent to the contest are going to be displayed as prints or on the web it's hard to determine the amount of sharpening, if I need to do it before submitting online. I have a feeling I'm not making myself clear.....

IMO, after all your editing, you should have saved it without sharpening. That's your master image.
Then make a copy for printing, and sharpen that. That way, if you need to reprint it at a different size later on, you can make a new output file at the correct size, and sharpen it accurately for that size.
And so on ...
Sorry, I know that's not answering your actual question, I'm just trying to give some advice.
I guess you should simply try further sharpening, and assess the results. If it looks over-sharpened, forget it. If it improves it, great!

Thanks Damo77.