- Adjust levels, curves, color balance, brightness and contrast; do this first!
- Isolate the main noisy areas. Because the filters will soften the picture, therefore you need to apply it only on the areas that really need it.
- Use filters for removing noise : in photoshop you can use Dust and scratches, Blur, gaussian blur, despeckle, etc. Don't forget to read the tips with channels first.
- Sharpen - Sharpening is imperative most of the times because the image will become soft if a large amount of noise was initialy included (don't use excessive blur). Use unsharp mask most of the time, as low as possible to avoid reverting back some of the artifacts
- Resize and crop the image for better composition - decreasing the image size will remove some of the artifacts, although some resolution will be lost; if you do it carefuly it's a good compromise; because it will also soften the picture, a low amount of unsharp mask will be required after the image has been decreased
If this is too complicated or you're just not having the time go to Neat Image and choose your camera's profiles from their library
png is nearly lossless. better than jpg and preferred over jpg... its just slow and the file sizes are much larger. It should work out well for you. Just do all your editing to the png version then save a high quality jpeg for upload.
Also... if you have Photoshop CS and shoot RAW, it was some nice noise reduction tools upon import. For some reason those same tools don't seem to be available for non-RAW images and I've tried resaving as RAW and reimporting, but it only recognizes the RAW compression produced by the digicam. I shoot all RAW now, because I've tested shooting at ISOs at 800 and 1600 and with a little tweaking have managed to get nearly noise-free images right out of Photoshop CS. Only catch is that you have to be working with a RAW image shot that way.
As said in the other thread many of the submissions we receive are containing a large amount of noise artifacts. Some designers may be pleased by the effect that a grainy picture has, but especially the noise added by digi cams disqualifies a shot from being a good stock.
In order to avoid having your image not being accepted please fix it first. This is good for your portfolio too, not only for submitting your files on Dreamstime.com
Here is a good reference to start with, explaing the channels and their role (Photoshop and Paint Shop Pro):
You're right, Sony 717 delivers the images as Tiff or JPEG, no RAW format.
But Tiff provides a better quality than JPG, although you can upload only JPGs here, so it's the same thing from this point of view.
Tiff and RAW are different formats indeed. RAW is the data that the CCD sees without any processing from the camera. This allows you to change setting as WB, color correction, easily later. Read more about RAW here