HDMI vs VGA cable

Hi, I just bought a mini Display port - DVI adapter + HDMI-DVI cable, but i notice some issues.
I think the quality of image on my Full HD tv is worse than when i connect the MBP to the tv with the VGA cable.
I tried to draw a single pixel on Photoshop and to see it on the tv:
- with the VGA cable, selecting 1920x1080 resolution, it makes black a single pixel on the tv
- with the HDMI cable, now it shows the resolution named 1080p in the monitor properties, i select it and i don't see a single black pixel, instead i see a diffused one.
What should i change in order to properly see a full hd video on my full hd television?

It sounds like perhaps the TV is overscanning when connected by HDMI and so the image is scaled and pixels are not one-for-one as they should be. One way to check for overscan would be to make the TV the primary Mac screen by running the MBP in closed clamshell mode so that only the TV is active and the MBP's internal screen is off. Instructions for doing this can be found here:
http://support.apple.com/kb/HT3131
If the TV is indeed overscanning when running from HDMI, you will have to refer to your TV's manual to see how to change among the various screen size options available through the TV's menu system. Hopefully there will be a setting that allows exact one-for-one display of pixels.
Also check the TV's manual for a Sharpness setting. Many TVs have a default sharpness setting that doesn't work well with computer text and graphics.

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