Simulating high and low resolution

Question

Edit: I'm using CS5
I'm clueless about creating an effect to an existing image.
I want a very small center point of the image to be unchanged. Just outside of the center should appear as if it's slightly lower resolution, and the further you go from the center the lower resolution it appears. So by the time you get to the edge of the picture it's not easy to tell what you're seeing. 
I think I want to do this one of two ways. I don't know which will look better or is possible.
1. Pixels combined to be the same color, perhaps some blur effect that increases away from the center, or,
2. An overlay of scattered black pixels only, with the concentration of black pixels increasing away from the center, or
3. the above two combined.

Answer 1

Hello Rich,
The actual excitation voltages you are reading don't go through the amplifier on the SCXI-1520. Therefore, when the excitation signals are included in the scan list, that can confuse NI-DAQ. If you look at the reading from the channel of the SCXI-1520, it will be off, but it will be off by a factor. What's happening is that when you read from the channel and then read from the excitation signals, no gain is being applied to the channel (even if you insert a range of +/- .1 V) but NI-DAQ thinks a gain is applied. So, NI-DAQ divides down the voltage even though it doesn't need to.
For instance, if you read from the channel of the SCXI-1520 first and include a limit of +/- 0.1 V, NI-DAQ thinks a gain of 100 will be used. The 1520 appl
ies no gain so your reading in LabVIEW will be 100 time less than it should be. This just happens when you are trying to apply a gain to a channel prior to reading from the excitation signals. I haven't found a source that says this, but my testing has pointed this out.
With regards to the PXI-4220, it should act the same way. If you take a look at the block diagram of the SCXI-1520 and the PXI-4220, both have the excitation signals (P+, P-) going directly to the multiplexer without passing through the amplifier. So the setup of both devices look the same. You can find the block diagram of the devices in the user manual's which I've linked below.
SCXI-1520
http://digital.ni.com/manuals.nsf/webAdvsearch/9CB6AB6E04D6510586256DF3007AD256?OpenDocument&vid=niwc&node=132100_US
NI PXI-4220 User Manual
http://digital.ni.com/manuals.nsf/webAdvsearch/F93CCA9A0B4BA19B86256D600066CD03?OpenDocument&vid=niwc&node=132100_US
Regards,
Todd D.
NI Applications Engineer