A few scanning tips

by Wayne Fulton

The Scanning section is BELOW

Photography

A few attempts to clarify some mysteries about the basics of flash and digital photography, hopefully helpful. More detail about fundamentals, how it works for those interested (good to know when you're ready).

Essential Fundamentals About Digital Images

Pixels, Printing dpi, Video dpi - What's With That?  First Basic Fundamentals

Image Resize - Cropping, Resampling, Scaling  Basics to use digital photos

White Balance Correction  Click on White things

Why Should I Shoot Raw?  It's the easy way to get quality

Depth of Field and Hyperfocal  with calculator, and a better way to blur the background

Field of View of Lens and sensor, with calculator

Crop Factor and Equivalent Focal Length, and the WHY of the Magnification illusion

f/stops and shutter speeds  Understanding the numbers, and a few lens properties

File Types, Bit Depth, Image size, Memory size  Details

What are JPG losses?  JPG Artifacts

RGB color  What is Digital Color?

Exposure Metering

How Light Meters Work  Maybe not as assumed

Details about Metering Principles  Including TTL flash

A Histogram is Not a Light Meter  Incident vs. Reflected meters

EV - Exposure Value and EV Chart

Sunny 16 Rule of daylight exposure

18% Gray Card  What's the Idea?

Do I need a handheld light meter? Sekonic L308S

Surprises in the Use of Histograms Use only the camera's three RGB histograms

Histograms are Gamma Encoded The numbers may not be what you think

What and Why is Gamma? with calculator for histogram values

Flash Fundamentals We Must Know

Introduction Basics about light and flash

Inverse Square Law Flash falls off with distance

Guide Numbers with calculator (even a HSS calculator)

Bounce Flash, and TTL Flash Compensation

Camera Distance Does Not Affect Exposure

Continuous light vs. Flash - Shutter Speed

Other Differences, Continuous vs Flash

Maximum Sync Speed The shutter limits it, Not the flash

HSS - High Speed Sync, What is it?

What is Soft Light?

Flash pictures are Double Exposures - Learn to use it

Flash Outdoors - Fill Flash in Sunlight

Flash Indoors - Factors affecting TTL exposure

What Hot Shoe Flashes Do

Auto ISO - but for flash?

Rear Curtain Sync - for Blur from Ambient Motion Trails

Matching White Balance of Room Lights - Colored Filters on Flash

Speedlights

A Beginners Guide to Select a Hot Shoe Flash   Part 2, chart

Guide Number calculator, even HSS too

Comparing Power of Flashes with Guide Number

Review of Yongnuo YN-565EX Speedlight

Review of Aperlite YH-700N Speedlight

Review of Neewer NW-985N Speedlight

Review of Neewer VK750 II Speedlight

Nikon TTL BL with D-Lens Distance Lens distance accuracy is poor

Third Party Flash Brands Bypass D-Lens Distance Problems

Speedlight AA Batteries

Comparisons of Optical Slave Triggers

Speed of Flash Units for High Speed Photography

Nikon TTL history - TTL, D-TTL, iTTL

Lighting

The Main skill is to Learn to Actually "See" the Lighting

A Standard Portrait Lighting Setup

What is Soft Light?

What Umbrellas Do

Mounting Speedlights in Umbrellas

Methods to Trigger Flashes

Nikon CLS Commander Wireless Remote Flash System (AWL)

Lighting Kits for Home Setups Flash is good for Portraits

Comparing Properties of Speedlights vs Studio Lights

Which is Softer, Reflected or Shoot-through Umbrellas?

Miscellaneous

Scanning Thousands of old Slides with a digital camera

Copying slides with a camera - calculator for macro lens or extension tube

Photo Editor Curve Tool (Curve tool compared with Levels)

Have we hit a megapixel limit?

Diffraction Limited Pixels? Really?

Memory Card Speed How much do we need?

Camera Exif Data Need a good Exif viewer?

Good Books on Flash Photography

Math tips of EV and precise camera numbers - f/stop, shutter, ISO

Solenoid Valve for Water Drop photography

Scanning

This scanning material is about the basics of scanning. It may be older material, but the basics are all still very valid. The purpose here is to offer some scanning tips and to explain the basics for scanning photos and documents. It is also about the fundamentals of digital images, about the basics to help you get the most from your images from your scanner and camera. How it works, for those who want to know.

Included here are the general questions that we've all asked about digital images. The material is about the basics, certainly not superficial, but it is not at all difficult either, it is just simply about how it works. It describes in plain language the things we need to know to efficiently get the most from our images, in the various ways that we can use them. Do realize that digital camera photos are already digitized (scanned, so to speak, meaning, first preference is to use your original camera file if you have it).

Many newbies want to scan a photo at the greatest possible resolution. We'll explain why that's the wrong answer, with tips about how to choose a more appropriate answer to match the actual job. That and many other scanning basics are covered here, and it's intended to be a fast jump start to aid newcomers to graphics and scanning. There will be a little technique to learn, but when you've seen it once, then it's rather simple.

Never used a scanner before?

Evaluating Scanner Features

Quick Summary of Digital Basics

Scanning / Printing dpi Calculator

Scanning 101
The Basics

START * Fundamental Concepts

Video Resolution - How much to scan?

Say No to 72 dpi - It's a false notion

File types, Bits, Image size, Memory size

Images for television or PowerPoint

Printing Resolution - Scaling and Resampling

The Scaling Menu - Scaling Output Size

Finding the Scaling and Resampling Menus

Printing Guidelines - Printing dpi

Printer Resolution - How much to scan?

Line art and Threshold - Copy, OCR, Text

Line art and Grayscale

Scanning for Fax

Descreen to remove Moiré Interference
   Images in printed media

Interpolated Resolution

Photo Resolution - How much can we scan?

Image File Formats - Which format?

Transparent Media Adapter - 35 mm slides?

What about Film Scanners?

Dynamic Range - 12 or 16 bits?

A few Links to Other scanning sites

A few Frequently Asked Questions - FAQ

Scanning 201

A Simple Way to Get Better Scans

Histogram

UnSharp Mask sharpening

Curve Tool

Clone Tool

Restoration of Genealogical Photos

Correction of Faded Slides

A few Typical
(models discontinued now)
Scanner Software

Acer Mirascan

HP PrecisionScan LT

HP PrecisionScan

HP PrecisionScan Pro

Microtek ScanWizard 5

Microtek ScanWizard Pro 6

Minolta Scan Dual II

Polaroid 4000

Umax VistaScan

Umax MagicScan

VueScan - still going strong!

Search Scantips.com

Google

Web scantips.com

CALCULATORS, with a few Extra features

Compare two camera Exposures

Compare two f/stop, shutter speeds, or ISO values 

Scanning and Printing DPI calculator

EV Chart and EV calculator

Guide Number calculator

HSS Guide Number calculator

Four Crop Factor calculators

Calculate Exact Aspect Ratio

Determine Distance or Size of an object in image

Calculate Histogram Gamma

Maximum image dimensions from Megapixels

Convert Bytes between KB, MB, GB, TB

There are Four Sizes of a digital image

Cropping to match print paper size

Calculate Diffraction - In support of Depth of Field

Improved “500 Rule” about Milky Way or star trails

Calculate motion blur or camera shake in pixels

Compare Inverse Square Law for two distances

Compare two Guide Numbers for relative Flash Power

Field of View calculator and Chart, and Math

Depth of Field and Hyperfocal - And a better way to blur the background

Guide Number of ganged flashes. Also exposure of metered Main & Fill

Percentage of Fill Flash of TTL Flash Compensation with Lighting Ratio calculation

Nominal & actual Precise Goal Charts of f/stop, shutter and ISO values

Copying slides with a camera - math for macro lens or extension tube - Image size, magnification, resolution

Chart of "The Numbers" for many sensors & film sizes - And more about Depth of Field


Please report any problem with the calculators, or with any aspect of any page content. Reporting of problems will be very much appreciated, thank you.

I do try to help with questions about the basics or about my material, but I cannot help with the "what hardware to buy" or "my hardware doesn't work" questions, so those two types of email will necessarily get no response.

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Copyright © 1997-2022 by Wayne Fulton - All rights are reserved.