Why are raster images still used when vector images have so many advantages?
I have read some posts and see many advantages of using vector images when compared to raster images:1. They can be zoomed or scaled at any ratio.2. File-size efficiency. Because vector image only identified by mathematical descriptions rather than for each pixel.3. It can be used for designing logos or magazines, because you can export to any size.I also searched and see that you can convert raster images to vector images with some tools. So my question is: With all the above advantages of vector images, why some photo manipulation softwares such as Photoshop still use raster images? Why don't we convert to vector image before doing something. And just convert back to raster image when we need export to some format such as bmp, jpeg ... when necessary.