![]() ![]() ![]() Likewise, Aspect ratio is rounded to a nominal value too, but the precise actual value is image width / height, in pixels. The camera specifications round off megapixels, but the precise value is image width × height in pixels. And then actual camera sensors typically round to multiples of 8 pixels (evenly divisible by 8). Adding or Subtracting one pixel to width or height can be thousands of pixels in the other dimension, so the rounded result necessarily can affect the megapixel total somewhat. Since images cannot be dimensioned in fractions of pixels, the result rounded to whole numbers is then shown (in green). Calculated pixel dimensions (in gray text) are excessively shown out to a few decimal places (even if pixels cannot have fractions), to show that the megapixels come out exact, matching the same as entered. The first option (Megapixels) calculation is the regular option.There are two calculator options, and the results for each case are: But dimensions of images cropped or resampled in your editor have low odds to be evenly divisible by 8. Precise megapixels and aspect values obtained from the actual camera image pixel dimensions should match it, but camera specifications otherwise round them. But resampled or cropped images might have any dimensions, likely Not divisible by 8.ĭiv8 - Images resized in photo editors can be any dimensions, but camera sensors actually use pixel dimensions which are evenly divisible by 8, no doubt to match JPG 8x8 compression blocks (I'll call that value Div8 here). ![]() Cameras create pixel dimensions evenly divisible by 8 (I will call it Div8, and is only size shown if already Div8 is specified). One pixel difference of width might affect a few thousand rows of height.ģ. Dimensions rounded to whole pixels, necessary for real pixels, but which changes megapixels a little. Exact computed dimensions (matches specified megapixels exactly, even if pixels cannot be fractional).Ģ. Three values of pixel dimensions may be shown, in the order of:ġ. Your results will come out closer if entering your actual real numbers instead of the rounded camera specifications.īut there are ifs and buts about everything, so trying to explain why the result megapixels may not exactly match your specified megapixels. Megapixels use the conventional 1000 = 1K, and NOT the 1024 = 1K used by memory chips.Īspect Ratio is exactly computed by image dimensions in pixels, Aspect Ratio = Width / Height. Megapixels are exactly computed by image dimensions in pixels, megapixels = Width × Height. The calculator will show the precise format, as like 1.3315:1 format. >This is for giclee prints, and giclee printing for Watercolors, watercolor paintings, watercolor artists, oil paintings, charcoal paintings, pastel, chalk, pen & ink, art fairs, art shows, art galleries, galleries, art exhibition, nude art, figure drawing, figure painting, giclée, fine art prints, giclée prints, photographers, photography, photo lab, inkjet, digital printing, artwork, artists.Aspect ratio 4:3 is 4/3 = 1.333, which can be entered here as:Ĥ:3 or 1.333:1 or 1.333, or as 1.338 if and when more precise. There are many other examples, but this should suffice in understanding the concept. You can have an 8″x12″, but not an 8″x10″. Now for example, if you want to make an 8″x10″ print from a 20″x30″ painting, you will realize quickly that you can’t do it. If you have a 20″x30″ painting, or 20/30 = 10, which equals 2/3, this gives you have a 2:3 aspect ratio. Dividing 18/24 by 6, you get 3/4, or a 3:4 aspect ratio. Factor your width and height to the lowest common denominator and you will have your aspect ratio.įor example, if you have a painting that is 18″x24″, then you factor 18/24 to its lowestĬommon denominator to understand the ratio. Even if you only finished 8th grade, you know how to figure out aspect ratios if you can remember how to factor fractions. Everybody had to do basic fractions to get out of middle school. Understanding aspect ratios can be intimidating, but it’s really quite easy.
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