Multimedia Studio YONG
林永佳（多媒体）工作室

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Understanding Photo Resolution & Picture Size

Photo Resolution:

Pixel = Picture Element

像素 = 相片元素

Pixel Aspect Ratio:

Photo pixel is square (1.0)     Video pixel can be square (1.0 FHD 1080p) or rectangular   HDV 1080p (1.33) NTSC DV (0.91) PAL (1.09)

Color Space:

On screen display color: RGB = Red + Green + Blue

Additive color

Printing Color: CMYK = Cyan + Magenta + Yellow + Black

Subtrative Color

Color comparison between RGB and CMYK:

Color depth is calculated by power of two ( 2ⁿ ), where n is the number of bit.

Camera Sensor to image:

Sony A7r IV: 9504 x 6336 (61 MP, 3:2)

Sony a9 II : 6000 x 4000 (24.2 Megapixels)

Canon EOS-1D X Mark III: 5472 x 3648 (20.2 Megapixels)

Canon EOS R5 : 8192 x 5464 (45.0 Megapixels)

Canon EOS 5D IV : 6720 x 4480 (30.4 Megapixels)

Canon EOS 6D : 5472 x 3648 (20.2 Megapixels)

Nikon D850 : 8256 x 5504 (45.7 Megapixels)

Standard Video Resolution:

Sensor size:

Picture Size:

Display Size:

 
    PPI ( Pixels Per Inch ) refers to the number of pixels contained within one inch of an image displayed on a computer monitor.

Best image viewing quality in 1:1 or 100% viewing size.

JPEG (Joint Photographic Experts Group) or JPG is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography.

The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality.

JPEG typically achieves 10:1 compression with little perceptible loss in image quality.

Printing Size:

  DPI ( Dots Per Inch ) refers to the number of printed dots contained within one inch of an image printed by a printer.

300 dpi for art book, high quality magazine

150 dpi for newspaper

50 dpi for roadside poster

TIFF (Tagged Image File Format) or TIF is a computer file format for storing raster graphics images, popular among graphic artists, the publishing industry, and photographers.

TIFF is widely supported by scanning, faxing, word processing, optical character recognition, image manipulation, desktop publishing, and page-layout applications.

The format was created by Aldus Corporation for use in desktop publishing.

File Size:

JPEG: Lossy format, small file size for screen display use.

TIFF: Lossless format, larger file size for high quality printing use.

Summary:

1. JPG images are lossy in nature while TIFFs are lossless
2. JPGs are much smaller compared to TIFFs even when compressed
3. TIFF is desired when the image still needs to undergo processing while JPG is best for final images
4. TIFF provides a compromis between RAW and JPGs
5. TIFF users are mostly professionals while common people use JPG
6. TIFFs are very rare in the internet while JPG is the norm for photos

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