Computer Science 2033A/B Lecture Notes - Lecture 2: Upsampling, Acne Vulgaris, Pixel

• School: Western University
• Department: Computer Science
• Course: Computer Science 2033A/B
• Professor: Vivi Tryphonopolous

Document Summary

An image that has been drawn or edited or touched up, digitally manipulated. Ai(cid:396)(cid:271)(cid:396)ushi(cid:374)g is (cid:449)hat the(cid:455) (cid:272)all the (cid:862)(cid:373)ag(cid:863) o(cid:396) (cid:862)(cid:373)agazi(cid:374)e(cid:863) look. All photo images (from camera, scanner) are bitmapped images (. jpg, gif, . png) Smallest unit of an image is the pixel (square) Are scalable- p(cid:396)ese(cid:396)(cid:448)es i(cid:373)age fidelit(cid:455) a(cid:374)d (cid:449)o(cid:374)"t (cid:271)e (cid:271)lo(cid:272)k(cid:455) if (cid:455)ou i(cid:374)(cid:272)(cid:396)ease o(cid:396) de(cid:272)(cid:396)ease size. Resolution independent takes on resolution of output device. Physically changing the pixel dimensions of the image for the web. You change pixel dimensions (width x height = total pixels) Resampling a small photo to a larger photo leads to blurriness/pixelation. You are changing the pixel dimensions (select image -> size, change size in pixels, check off (cid:862)resa(cid:373)ple(cid:863) (cid:271)o(cid:454). Affe(cid:272)ts the ph(cid:455)si(cid:272)al di(cid:373)e(cid:374)sio(cid:374)s of the i(cid:373)age/ document size too) Eliminating pixels, therefore deleting info and detail from your image. Eliminates by averaging the values of source pixels contributing to each output pixel.