Post 5: Alpenglow Imaging

Overall, the information read while it did have many topics including: resolutions, pixels, dpi, ppi, was mainly about distinguishing the two between dpi and ppi. Pixels cannot be changed physically only through resampling as they are a physical property of an image. Dpi is a spatial resolution in that it has no size or physical dimensions and cannot be changed until it is physically printed. It is important to not mix the two and not mix them up as they are both very different. There is a common misconception they are they same and that is why it is noted to not listen to someone that wants to tell you the dpi of a camera as they are wrong because a camera does not have dpi resolution, since it is a variable.

The way the printer works is the dpi changes to accommodate the specifications in the commands of the print while the pixels are not changed nor the file itself. The only way the pixels are changed is if they are changed by resampling which gets rid of some of the pixels, but to perform the same function of resizing. In doing so, having less pixels causes the image to loose some of it's color as the pixels must be spread through the picture to accommodate what was lost. Scanners on the other hand do the opposite, and work by taking the documented image and transferring it into pixels.


I found this article very interesting as I enjoy taking pictures myself. Not to mention in the digital world we live in, we usually take for granted the how exactly our digital media works especially in the form of images. I actually didn't know a lot about pixels or dots per inch but this article was very informative. I learned that an actual image has no set size but is really only limited to either if the sensor or camera has a pre-set size but as a data file it does not. A camera takes the image and has a certain amount of pixels and dpi but they are far from the same thing. Dpi is mainly used for images when they are printed through documented form such as through a printer and can be resized without actually changing the amount of pixels.


The website at the bottom of the page had the print resolution chart to help set the best image possible. The link to this website is as follows: http://www.alpenglowimaging.com/resolution.htm