clear all

mm
mm
dpi
7360 × 4912 pix



pix
pix
dpi
519 × 347 mm


mm
pix


360 dpi


Image Size 519 × 347 mm     
DPI / PPI 360 dpi
Total Pixels 7360 × 4912 Pixels      36.15 Mpx
Color Depth 24 Bit    [ 224 ]    
Total Mb (binary) 103.43 MB    108456960 bytes
Pixel Size 4.9815 µm2       = (4.9815 · 10-3) mm2  



engl. measure 1 Inch = 25.4 mm
Dot per Inch 1 dpi = 1 Dot per Inch(25.4 mm)
pixels per Inch 1 ppi = 1 dpi = 1 Pixel per Inch(25.4 mm)



Byte Digital 1Byte= 8 Bit  
KB Digital 1 KB = 1024 Byte  
MB Digital 1MB = 1024 KB 1MB = 1024 x 1024 Byte



Example : pixels/Bytes calculate - image: 1000px · 2000px
Bytes = Total pixels · color depth 8 Bit [1 Byte]
(1000px · 2000px) · 24 8 bit = 6000000 Bytes = 6MB

Example: Image 5x5 pixels (12.7 x 12.7 mm)
Formula calculation of length or width, pixels and dpi
length [mm] = Pixel · 1 Inch [25.4mm] dpi
12.7 mm = 5px · 25.4mm 10 dpi
Pixel = dpi · Länge [mm] 1 Inch [25.4mm]
5px = 10dpi · 12.7mm 25.4 mm
dpi = Pixel · 1 Inch [25.4mm] Länge [mm]
10dpi = 5px · 25.4mm 12.7mm



Image for print 300 dpi, for photo album 
Image Bild: 13 x 18 cm Quality of print 300 dpi 
Resolution in pixels?
Vertical 13cm [130mm] 
300dpi · 130mm 25.4mm = 1535 Pixel

Horizontally 18cm [180mm] 
300dpi · 180mm 25.4mm = 2126 Pixel

Total pixels   [Mpx]
1535px · 2126px 1'000'000 = 3.26 MegaPixel



Print Image 300 dpi, for photo album 
Image: 1024 x 768 pixels Quality of print: 300 dpi 
Which picture size for printing?
Vertical 768 Pixel 
768px · 25.4mm 300 dpi = 65 mm

Horizontally 1024 Pixel
1024px · 25.4mm 300 dpi = 87 mm




slide scanning for a slideshow on the TV 
TV 40 inch Resolution : 1'920 x 1'080 pixels Photo-Slide : 24 x 36 mm  
Scan resolution?
Vertical 1'080 pixels 1080 Pixel  
1080px · 25.4mm 24 mm = 1143 dpi

Image Size Horizontally:
Horizontally 18cm [180mm]
1143 dpi · 36 mm 25.4 mm = 1620 Pixel




Slide scanning for print a Poster 
Slide Size : 24 x 36 mm Poster Size : 900 x 600 mm Scanner Resolution: 4000 dpi DPI 1:1  
Scan resolution?

1. Pixels:
Horizontally 36 mm  
4000 dpi · 36 mm 25.4 mm = 5669 Pixel


2. Poster
Slide horizontally 36mm
5669 px · 25.4 mm 900 mm = 160 dpi