MobileRead Forums - View Single Post - How does kindle scribe clarity and contrast compare to PW?

Quoth · 05-14-2023, 10:01 AM

PW3, PW4, PW5 and Scribe all have the same resolution in dpi or ppi. Only the total pixels differ, due to different screen sizes.

They all in theory have exactly the same sharpness. Variations are due to blurring and diffraction effects of the layers on top of the actual active part of the scree,

PC graphics modes are often confusingly stated as HD resolution, or SVGA resolution or 4K resolution. These are not resolutions as you need to know the screen size. It's horizontal (or vertical) physical dots or pixel count divided by screen width in inches that gives the dpi or ppi.
Vertical will give the same answer unless the dots/pixels are not the same size in both axis. Thus a 15″ a true HD format monitor/screen has identical resolution to a 30″ 4K (PC/TV not Cinema) monitor screen, if both are 16:9 aspect ration (about 147 ppi). True "HD" at 16:9 is 1920 x 1089 vs 3840 x 2160 for "4K" 16:9 monitor/TV irrespective of screen size.

See https://www.sven.de/dpi/

Thus for about 300 dpi an HD screen would be about 7.4" diagonal and for 4K about 14.8" (14.685" is very close to 300 dpi). An Ereader screen is often 3:4 ratio. old TVs before 1947 maybe 5:4, later 4:3. Widescreen TV is 16:9. Some monitors, phones and tablets are 16:10 or even 21:9 = 3:1.

Screen size or total number of pixels alone tells you nothing about resolution. Resolution is number of pixels on a line divided by the phyiscal length of the line.

EDIT:
1) The HD Ready is meaningless. It simply means, whatever the poor native pixel count or shape of screen is, an HD 1920 x 1080 image will display, with maybe only 30fps interlace or 25 fps interlace. No assurance progressive 25, 30, 50 or 60 works.
2) Domestic monitor / TV 4K assumes a 16:9 screen. Cinema/movies have many Wide Screen ratios and there are many resolutions in Cinema called 4K. See https://en.wikipedia.org/wiki/4K_resolution Also "resolution" is a misnomer for pixel count! A so-called 4K Resolution screen could be 72 ppi to 360 ppi (or higher, see so called retina screens).

05-14-2023, 10:01 AM	#5
Quoth Still reading Posts: 14,440 Karma: 107078855 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	PW3, PW4, PW5 and Scribe all have the same resolution in dpi or ppi. Only the total pixels differ, due to different screen sizes. They all in theory have exactly the same sharpness. Variations are due to blurring and diffraction effects of the layers on top of the actual active part of the scree, PC graphics modes are often confusingly stated as HD resolution, or SVGA resolution or 4K resolution. These are not resolutions as you need to know the screen size. It's horizontal (or vertical) physical dots or pixel count divided by screen width in inches that gives the dpi or ppi. Vertical will give the same answer unless the dots/pixels are not the same size in both axis. Thus a 15″ a true HD format monitor/screen has identical resolution to a 30″ 4K (PC/TV not Cinema) monitor screen, if both are 16:9 aspect ration (about 147 ppi). True "HD" at 16:9 is 1920 x 1089 vs 3840 x 2160 for "4K" 16:9 monitor/TV irrespective of screen size. See https://www.sven.de/dpi/ Thus for about 300 dpi an HD screen would be about 7.4" diagonal and for 4K about 14.8" (14.685" is very close to 300 dpi). An Ereader screen is often 3:4 ratio. old TVs before 1947 maybe 5:4, later 4:3. Widescreen TV is 16:9. Some monitors, phones and tablets are 16:10 or even 21:9 = 3:1. Screen size or total number of pixels alone tells you nothing about resolution. Resolution is number of pixels on a line divided by the phyiscal length of the line. EDIT: 1) The HD Ready is meaningless. It simply means, whatever the poor native pixel count or shape of screen is, an HD 1920 x 1080 image will display, with maybe only 30fps interlace or 25 fps interlace. No assurance progressive 25, 30, 50 or 60 works. 2) Domestic monitor / TV 4K assumes a 16:9 screen. Cinema/movies have many Wide Screen ratios and there are many resolutions in Cinema called 4K. See https://en.wikipedia.org/wiki/4K_resolution Also "resolution" is a misnomer for pixel count! A so-called 4K Resolution screen could be 72 ppi to 360 ppi (or higher, see so called retina screens). Last edited by Quoth; 05-14-2023 at 10:13 AM.