Drdan,
To open up shadows in photoshop
.
1. Dupe the image
Click [Image] on the menu bar
Select [Duplicate] from the drop-down-dialog box
Name the duplicated image Mask
Click OK
2. Click [Image] on the menu bar
Click [Mode] in the d-d-d (drop-down-dialog) box and then click [Grayscale]. Click OK
3. Click [Filter] on the menu bar
Click [Blur] in the d-d-d box.
Click [Gaussian Blur] in the next d-d-d box
Move Radius slider to the right until the shadows are blurred. Click OK.
The amount of blur determines how much of the shadow area will be opened up.
4. Click [Image] from the menu bar
Click [Adjustments] from the d-d-d box and select [Invert]
5. Click on the original image to make it active
6. Click [Select] from the menu bar
Click [Load Selection] from the d-d-d menu box
select Mask from the [Document list] in the next d-d-d box. Click OK
7. Type CNTRL + J to make a copy layer of the background
8. Click [Select] from the menu bar
Click [Load Selection] from the d-d-d menu bar
From the resulting d-d-d box, select Mask from the [Document list]
9. Select [Edit] from the menu bar.
Click [Fill] from the d-d-d box
From the resulting d-d-d box, select 50% Gray from the [contents list]
Set [Blending Mode] to [color dodge]
Set [Opacity to 100%]
Click the check box for [Preserve Transparency]
Click OK.
10. To open the shadows up even more from this point
Select [Edit] from the menu bar.
Click [Fill] from the d-d-d box
Click OK
If there is more noise after this technique, it will be from re-compressing the JPG--not from the photoshop technique