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Digital Photography

• Digital photography involves saving images digitally, as files viewable on computers.
• Two methods exist:
  • Photographic images are taken, then developed, printed, and scanned to create digital files.
  • Digital cameras capture images directly, which is faster and easier.
• Traditional cameras record photos on film, which requires processing and printing.
• Digital cameras record images electronically using a light-sensitive Charged Coupled Device (CCD) sensor.
• This sensor captures reflected light as blue, green, and red light points. the points form the image, ready for computer or television viewing, editing, and adjustments. The image can be viewed on the camera's viewfinder. Digital images can appear similar to traditional photo images, but with significant differences.

Traditional vs. Digital Photography

• Traditional photography requires a camera, film, a darkroom with chemicals, photographic paper, and an enlarger.
• Digital photography requires a camera, computer, image editing software, a printer, and the table (1) below explains the difference between them.

Table 1: Traditional vs Digital Photography

• Traditional photography uses silver halide film crystals in a sensor, while Digital photography uses an electronic chip (CCD).
• The image produced by traditional photography is negative, while the digital image is digital.
• Traditional photography uses a darkroom with chemicals and paper, while Digital photography uses a computer and printer.
• Traditional photography requires extended processing to develop a print from the film, but digital photography creates the image immediately.
• Post-processing is possible in digital photography, while it is limited in traditional photography.
• Digital images can be stored digitally or printed with a printer.

Digital Image Definition

• A digital image is a visual representation stored in a binary encoded system.
• Two Types: Raster (made of pixels) and Vector (made of points).
• Other definitions:
  • A digital image is a collection of points (pixels) arranged into a grid, each with a particular color or shade of gray, producing a continuous image.
  • A digital image is any image stored numerically (digitally) on a storage device, displayed or printed from a storage device.
• Digital images and their multiple benefits have increased their use in many fields.
• Digital image use allows for easy storage, distribution, editing and printing with various formats and high quality replicates.

Advantages of Digital Photography

• Cost savings in the long run by eliminating film costs.
• No harmful chemicals used, reducing environmental pollution.
• Immediate image viewing and editing via digital cameras.
• Improved image quality through digital adjustments and viewing.
• Digital cameras can also record short videos.
• Software like Adobe Photoshop for editing images.
• Easy sharing of image files through various formats, printing, and online media.
• Better preservation through digital storage compared to traditional film.
• Ability to make multiple copies at the same quality, unlike traditional process.
• Easier and faster image processing compared to traditional methods.
• Adding text and records via computer.
• Various acquisition sources: digital imaging, libraries, museums, CDs and internet, as well as scanning of traditional images.