What is the difference between contrast and density

That is because 1-bit can only store one of two values, 0 white and 1 black. An 8-bit image can store possible gray values, while a bit image can display gray values. Print Save your progress. Your session is about to expire. Do you want to continue logged in? Cancel Continue. But you're still altering the negative in such a way as to create readability in a neg that would otherwise be unreadable.

I think people are drawn to the stark, grainy edginess of the pushy look. They like the transformation rendered by pushing. It creates a negative emotionally , down look. It creates a sense of grittiness and maybe realism.

You could say it gives pictures a sense of abstraction and reduction to lithographic essentials. That's not an argument in favor of pushing!

Just thinking aloud since so many posts are about pushing. Ask yourself if density is abnormally increased, or decreased. Ask yourself how dense it is in relation to adjacent normal structures. Kvp :to penetrate 75 kvp 79 kvp 79 kvp High and low mAs effect.. Density is determined principally by mAs As shown by these radiographs of abdomen taken at 70 kvp. Scatter radiation fog the film making it Gary and reduces the contrast. The more scatter there is the lower the contrast You can reduce the amount of scatter radiation by lowing kvp.

Kvp has to be high enough to penetrate. Reduce formation of scatter; 1. Used of compression. Beam Restriction devices. Used of low kvp. Air gab technique. Used of lead blocker 3. Tissue 1. When tissue compressed, scatter radiation is reduced resulting in lower dose and improve image contrast reduced fog Beam Restriction devices 1.

Diaphragms 2. Cones 3. Collimators 4. Number of lead strips per inch. When to use a grid? Above 60 kvp. Total views 10, On Slideshare 0. From embeds 0. Number of embeds