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Formulas for converting DPI - PPI, mm - cm - inches and pixels
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Calculation of length or width, pixels and DPI with the following specifications:
Image: | 3266×2449 Pixel (8Mpx, 4:3) |
Print size: | 277 × 207 mm |
Pixel density: | 300dpi |
With these formulas you can convert the length, pixels and DPI / PPI:
pixel = dpi * mm / 25.4 mm (1 in)
Bytes = pixel * color depth / 8 bit (1 Byte)
Examples: print resolution, scan resolution and image size in practice
I want to print a picture for the photo album, 13 x 18 cm, with good quality. How big does the resolution have to be in pixels?
A good quality picture for a photo album is printed at 300 dpi. To calculate the resolution in megapixels, multiply the number of pixels of length and width and divide them by mega (1 million).
Multitouch 1 8 – handful trackpad gestures. pixel x = 300 dpi * 13 mm / 25.4 mm = 1535 pixel
pixel y = 300 dpi * 18 mm / 25.4 mm = 2126 pixel
resolution = 1535 px * 2126 px / 1`000`000 = 3.3 Mpx
I have an image with 3264 x 2448 pixels and would like to print it as a poster. How big can I print the poster?
In contrast to a small picture in the photo album, the poster does not have to have a high pixel density, as this is viewed from a greater distance and the pixels become smaller for the eye. Approx. 100 dpi is recommended for a poster.
length = 3264 px * 2.54 cm / 100 dpi = 83 cm
width = 2448 px * 2.54 cm / 100 dpi = 62 cm
I would like to scan slides and present them with a slide show on the television. Screen TV 40 inches; Resolution: 1,920 x 1,080 pixels. How big does the scan resolution have to be?
The dimensions of a slide are 36 x 24 mm, so the aspect ratio does not match that of the television (television = 16: 9 slide = 3: 2). We only calculate the pixel density of the height of the image, as this is the limiting measure.
dpi = 1080 px * 25.4 mm / 24 mm = 1143 dpi
Resulting image size horizontally in the correct aspect ratio:
pixel = 1143 dpi * 36 mm / 25.4 mm = 1620 pixel
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I would like to print a poster of 900 x 600 mm with the maximum resolution from a slide. How good will the quality be in 'dpi'?
The maximum resolution of the scanner is 4000dpi, a slide has the dimensions of 36 x 24 mm. After you have calculated the number of pixels, you can use the dimensions of the poster to calculate the pixel density.
pixel = 4000 dpi * 36 mm / 25.4 mm = 5669 pixel
dpi = 5669 px * 25.4 mm / 900 mm = 160 dpi
Units
engl. unit of length | 1 Inch = 25.4 mm |
dots per inch | 1 dpi = 1 Dot per Inche(25.4 mm) |
pixel per inch | 1 ppi = 1 Pixel per Inch(25.4 mm) |
digital unit of measurement | B = Byte 1 bit = 0 | 1 1 B = 8 bit 1 kB = 1024 B 1 MB = 1024 kB |
Important notes:
GraphicConverter 11 is a paid upgrade for all customers of version 1.x-10.x. You can order the upgrade at the order page.
Customers who bought the app from the Mac App Store have to download and install any updates from within the Mac App Store. Updates maybe delayed in the Mac App Store due the Apple review process.
GraphicConverter 11
- version 11.5.2
- Universal Binary for Intel and Apple Silicon Macs
- record and save macros, RAW images, unpack archives, wide equalization and much more
- requires Mavericks (macOS 10.9) up to Big Sur (macOS 11.x), the upcoming Montery (macOS 12.x) is already supported
- new features of each macOS are supported
- approx. 260 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Japanese, Norwegian, Russian, Spanish, Swedish
Download now (from Lemke Software server)
Download now (from MacVF.com)
Checksum: SHA256 9bb6c6c04e17a054371255edd40f055c56fe6299ae544d8355a65bfcde0947ff
- version 10.7.5
- face detection, collage, picture package and much more
- requires macOS Maverick (10.9) up to Mojave (10.14.x)
- new features of Maverick, Yosemite, El Capitan, Sierra, High Sierra and Mojave are supported
- approx. 175 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Japanese, Norwegian, Russian, Spanish, Swedish
Download now (from Lemke Software server)
Checksum: SHA256 8401ca53455f53628e714fdfa16222446bb31970faa1aa6d1c80a363f16d5176
Adobe Flash Player 11.1
GraphicConverter 9
- version 9.7.6
- 64 bit version for Intel Macs
- requires Mac OS X 10.8 up to 10.11
- new features of Mountain Lion, Maverick, Yosemite and El Capitan are supported
- approx. 90 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Japanese, Norwegian, Russian, Spanish, Swedish
Examples: print resolution, scan resolution and image size in practice
I want to print a picture for the photo album, 13 x 18 cm, with good quality. How big does the resolution have to be in pixels?
A good quality picture for a photo album is printed at 300 dpi. To calculate the resolution in megapixels, multiply the number of pixels of length and width and divide them by mega (1 million).
Multitouch 1 8 – handful trackpad gestures. pixel x = 300 dpi * 13 mm / 25.4 mm = 1535 pixel
pixel y = 300 dpi * 18 mm / 25.4 mm = 2126 pixel
resolution = 1535 px * 2126 px / 1`000`000 = 3.3 Mpx
I have an image with 3264 x 2448 pixels and would like to print it as a poster. How big can I print the poster?
In contrast to a small picture in the photo album, the poster does not have to have a high pixel density, as this is viewed from a greater distance and the pixels become smaller for the eye. Approx. 100 dpi is recommended for a poster.
length = 3264 px * 2.54 cm / 100 dpi = 83 cm
width = 2448 px * 2.54 cm / 100 dpi = 62 cm
I would like to scan slides and present them with a slide show on the television. Screen TV 40 inches; Resolution: 1,920 x 1,080 pixels. How big does the scan resolution have to be?
The dimensions of a slide are 36 x 24 mm, so the aspect ratio does not match that of the television (television = 16: 9 slide = 3: 2). We only calculate the pixel density of the height of the image, as this is the limiting measure.
dpi = 1080 px * 25.4 mm / 24 mm = 1143 dpi
Resulting image size horizontally in the correct aspect ratio:
pixel = 1143 dpi * 36 mm / 25.4 mm = 1620 pixel
Graphic Converter 11 1 320 Bit
I would like to print a poster of 900 x 600 mm with the maximum resolution from a slide. How good will the quality be in 'dpi'?
The maximum resolution of the scanner is 4000dpi, a slide has the dimensions of 36 x 24 mm. After you have calculated the number of pixels, you can use the dimensions of the poster to calculate the pixel density.
pixel = 4000 dpi * 36 mm / 25.4 mm = 5669 pixel
dpi = 5669 px * 25.4 mm / 900 mm = 160 dpi
Units
engl. unit of length | 1 Inch = 25.4 mm |
dots per inch | 1 dpi = 1 Dot per Inche(25.4 mm) |
pixel per inch | 1 ppi = 1 Pixel per Inch(25.4 mm) |
digital unit of measurement | B = Byte 1 bit = 0 | 1 1 B = 8 bit 1 kB = 1024 B 1 MB = 1024 kB |
Important notes:
GraphicConverter 11 is a paid upgrade for all customers of version 1.x-10.x. You can order the upgrade at the order page.
Customers who bought the app from the Mac App Store have to download and install any updates from within the Mac App Store. Updates maybe delayed in the Mac App Store due the Apple review process.
GraphicConverter 11
- version 11.5.2
- Universal Binary for Intel and Apple Silicon Macs
- record and save macros, RAW images, unpack archives, wide equalization and much more
- requires Mavericks (macOS 10.9) up to Big Sur (macOS 11.x), the upcoming Montery (macOS 12.x) is already supported
- new features of each macOS are supported
- approx. 260 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Japanese, Norwegian, Russian, Spanish, Swedish
Download now (from Lemke Software server)
Download now (from MacVF.com)
Checksum: SHA256 9bb6c6c04e17a054371255edd40f055c56fe6299ae544d8355a65bfcde0947ff
- version 10.7.5
- face detection, collage, picture package and much more
- requires macOS Maverick (10.9) up to Mojave (10.14.x)
- new features of Maverick, Yosemite, El Capitan, Sierra, High Sierra and Mojave are supported
- approx. 175 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Japanese, Norwegian, Russian, Spanish, Swedish
Download now (from Lemke Software server)
Checksum: SHA256 8401ca53455f53628e714fdfa16222446bb31970faa1aa6d1c80a363f16d5176
Adobe Flash Player 11.1
GraphicConverter 9
- version 9.7.6
- 64 bit version for Intel Macs
- requires Mac OS X 10.8 up to 10.11
- new features of Mountain Lion, Maverick, Yosemite and El Capitan are supported
- approx. 90 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Japanese, Norwegian, Russian, Spanish, Swedish
- version 8.8.3 with Cocoa frontend and rewritten backend
- 32/64 bit version for Intel Macs
- requires Mac OS X 10.6.8 up to 10.9.x
- new features of Lion and Mountain Lion are supported
- approx. 190 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Norwegian, Spanish, Swedish
11.1 Itunes
GraphicConverter 7
- version 7.6.2 with new a frontend rewritten in Cocoa
- universal binary version
- requires Mac OS X 10.5 up to 10.7.x
- approx. 100 MB
- multilingual (Brazilian Portuguese, Chinese (simplified), Chinese (traditional), Czech, Danish, Dutch, English, French, German, Italian, Spanish, Swedish)
Please click here to download older versions.
Graphic Converter 11 1 320 Driver
This is a little tool to trash the preferences. It runs on 10.6 or later.