On 11/06/2016 02:16 AM, bronxsystem wrote: > Hey all > I am new at this very new. > > Ive spent over an hour to just draw this shape ive tried different things but > how is it so blurry/pixely? how to i make it smooth and sharp?
Since a digital image is made of pixels, making smooth curves in digital images is not a possible thing, and what appear to be smooth curves and diagonal lines actually have stair-step edges when you look closely. This jagged-edge appearance is called aliasing. Anti-aliasing creates a better illusion of smoothness by averaging out the colors of foreground pixels with their background, "as if" one were taking a digital photo of a real object. The painting and selection tools in the GIMP use anti-aliasing by default. To get the /appearance/ of smooth, sharp edged curves, increase the resolution of the image: The more tiny squares one has, the better the illusion of smoothness. Resolution is measured in DPI, which means dots (i.e. pixels) per inch. Many years ago, a typical computer monitor had 72 pixels per inch; for this reason, the default resolution for digital images in most editors, scanners, etc. is 72 DPI. Today monitors have at least 96 DPI resolution, so 96 DPI is a "better" default for images intended to be seen on websites, etc. Printers have much higher resolution, and 300 DPI is normally considered minimum for most images that will be printed, although pictures that will be used in typical word processor documents printed in grayscale on plain paper can normally squeak by at 150 DPI - and their size on disk is about 1/4 that of equivalent 300 DPI images. Plan ahead: The first thing to do when making a new image or editing an existing photo is to determine how large it should be. For instance, a picture that will be about 2" x 3" when displayed on a web page or in an electronic document should be at least 2x96 = 192 pixels by 3x96 = 288 pixels. If the same image is intended to be printed, it should be at least 2x300 = 300 pixels by 3x300 = 900 pixels. Again, if in doubt make your "original" image larger, because scaling it to a smaller size is less destructive than blowing it up. Normally you will want to save your XCF file at "full size", then scale it down to export a JPG, PNG or etc. image for display or printing. If an image might be used for both screen display and print, make it at 300 DPI, and export a scaled down copy for use on websites or etc.; scaling an image down creates less visual "noise" than scaling an image up. The relevant GIMP manual page: https://docs.gimp.org/en/gimp-image-scale.html Note: If you want /real/ sharp edges on curved objects, that's possible with vector based editors like CAD programs, Inkscape, etc. Photo editors work with grids of pixels, but vector editors use mathematical expressions that describe curves etc. precisely, and the same vector image looks "right" when rendered at any scale from matchbook cover to billboard. That's why frequently re-used images like company logos should be created with a vector editor; any place you need that image, just export a copy at the exact scale required. Vector images are also used with tools like plotters, CAD/CAM devices, etc. and in silk screen and offset printing applications. :o) Steve _______________________________________________ gimp-user-list mailing list List address: firstname.lastname@example.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list