相片質素,曬相問題??

比較困難。因為即使是使用photoshop等將resoulution的dpi提高，只會等於先將圖片版面擴大後，再在空白的pixel上增添附近差不多的顏色，所以曬出來都是很矇的。
如果真的要解決，最基本的要用photoshop，再在相片的不同地方自行增加一些效果，例如sharpen或者是加色。相片本身的質素要改善…便可能要用一些較高深的程式，但暫時沒想到有。

Honestly, there is NO WAY to improve the photo quality up to regular standard! Using Photoshop is just to enhance the current quality, but if the original quality is fairly poor, even Photoshop expert can't do anything with it. The result would only be unnatural and weird.

The reference calculation is, " pixels " (resolution) divided by " dpi " (dots per inch) and you'll get the max. output size. For example, you want to make a print from a 1280 x 960 image in 200 dpi, the calculation is: (1280 divided by 200) x (960 divided by 200) = 6.4 inch x 4.8 inch (max print size).

In your case, I think those images you downloaded from the website are not supposed to let people download and print (maybe the owner wants to protect those images for other people downloading), so they're in very low resolution, 72dpi is only good for internet viewing or really small print in acceptable quality. For example: 640 divided by 200dpi x 424 divided by 200dpi = 3.2 inch x 2.12 inch (in fair quality) or 640 divided by 300dpi x 424 divided by 300dpi = 2.13 inch x 1.14 inch (in good quality).