Pixel Online Kalkulator  DPI PPI Rechner
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Online Pixel DPI PPI Conversion - Calculator - Converter


   
           
mm x mm dpi
pix x pix dpi
mm   pix  

Image Size x mm     
DPI / PPI dpi
Total Pixels x Pixels      Mpx
Color Depth 24 Bit    [ 224 ]    
Total Mb (binary) MB     bytes
Pixel Size  



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

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

Pixel =   DPI x Länge[mm]
1 Inch[25.4mm]

DPI =   Pixel x 1 Inch[25.4mm]
Länge[mm]

12.7 mm =   5px x 25.4mm
10 dpi

5px =   10 dpi x 12.7mm
25.4

10 dpi =   5px x 25.4mm
12.7 mm

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

Example : Formula  
Bytes =   Total Pixel x color depth
8 Bit [ 1 Byte ]

MB =   Bytes
1 KB x 1 KB

75 bytes =    25px x 24
8 Bit

MB =   Bytes
1024 x 1024

Examples  
Questions Given Question
Image for print 300 dpi,
for photo album

Image: 13 x 18 cm
Quality of print: 300 dpi

Resolution in Pixels?

Vertical 13 cm = 130 mm
300 dpi x 130mm = 1535 Pixel 
25.4

Horizontally 18 cm = 180 mm
300 dpi x 180mm = 2126 Pixel 
25.4

Total Pixel
1535 px x 2126 px = 3.26 MegaPixel 
1'000'000

Print Image 300 dpi,
for photo album

 

 

Image: 1024 x 768 Pixel
Quality of print: 300 dpi

Which picture size for printing?

Vertical 768 Pixel
768 px x 25.4 = 65 mm 
300 dpi

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

slide scanning for a slideshow on the TV TV 40 inch
Resolution : 1'920 x 1'080 Pixel
Photo-Slide : 24 x 36 mm
Scan resolution?

Vertical 1'080 Pixel
1'080 px x 25.4 = 1143 dpi 
24 mm

Image Size Horizontally:
Horizontally 18 cm = 180 mm
1143 dpi x 36mm = 1620 Pixel 
25.4

Image Size on the TV : 1080 x 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 x 36mm = 5669 Pixel 
25.4

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