Scanning Project 9-Scanning Software

As important as the mechanical and optical characteristics of the scanning machine are, the software you use to scan has an equally profound effect on results. Manufacturer labeled software plus other software may come bundled with your scanner. In some cases, and depending on your goals, the scanner maker-labeled software supplied might be sufficient to your needs. Check it out before you buy more software. In general, heavy users will probably want to check out third-party software as well.

Some programs are quite simple in terms of their options and certainly can be used for prints and some film work; a more feature-rich package is where you will find options for many types of film and sophisticated enhancements and corrections. However, I rarely use the initial scan as my final anyway and make very basic adjustments in the scan and pass along the file to image editing software for corrections. This is not to say that you scan on Auto, as the settings you make will have a profound effect on the type and quality of file you create.

Note that some older scanners, while fine machines, may have issues working with newer operating systems, so always check compatibility before making a software buying decision. Some third-party software makers offer updated versions of scanner drivers for use in newer operating systems; unfortunately, equipment manufacturers rarely do, opting to sell you a new scanner rather than service their older machines or, in some cases, have dropped making scanners altogether and simply do not support their older products. This is somewhat reprehensible, but nothing new in the computer electronics game. Check the contact information at the end of this post for web sites where you can crosscheck older scanners with third-party software to see if you can find a fit.

Here is the input screen on Epson's scanner software. Click on the image to enlarge it if need be. The input here is for 24-bit color (8 bits per RGB channel) at 4800 dpi from a 35mm slide. Unsharp masking is set, Note the various adjustments available, When you click on one of the icons a control panel comes up where you can make changes.

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While many folks still use “older” scanners they tend to do so with older computers (read older OS’s) as well. There is no problem with this, and it’s why I rarely recycle “old” computers.

Following are some important items that should be part of the scan software. Note that each brand and version of software will differ in how these parameters are input, and each format and image type (film, print) will differ slightly in the options offered or required.

You may find that the “brand name” software that comes bundled with your scanner is not a complete as you would like for some projects, but is perfectly fine for others, While scanner company software can handle many tasks, my experience is that as you get deeper into scanning or want a fuller range of tools you will probably want to explore the third-party options as well.

I will go over each of these scan tool options in step-by-step fashion in the workflow section. For now, here’s a summary:

File Name: Each scan or set of scans should have a unique name/number that will help you sort the images out later. You also choose a “path” or specific folder into which the scanned image is placed after it is done.

Type of Image: This offers the choice of reflective (print) or transparent (film). This requires a different physical setup of the flatbed scanner for each.

Bit Depth: As in a previous post, this determines the amount of information per pixel in the scan. Higher bit depth equals more image information but it can really jump up file size.

Resolution: As discussed previously, the pixels per inch of the scan. Higher numbers offer the ability for bigger enlargements, although some formats may have quality limitations. Higher resolution will also boost file size. When scanning, choose the original image size as the output and use the resolution to get larger file, thus print size capability.

Image File Format: Generally you can choose JPEG or TIFF file formats. Keep in mind that JPEGs are compressed files, and TIFF is the better choice, although if you are scanning for a web page only JPEG is the way to go. My choice is to scan TIFF as I can always batch process any TIFFs to sized JPEGs later.

Image Parameters: This can include contrast, midtone placement, color balance and saturation, all of which you control with sliders or similar tools. My approach is to scan as “neutral” as possible (not trying to over-correct) while still retaining as full a tonal scale as possible, although some tweaks here, depending on the sophistication of the software, can emulate what you might be able to achieve in image editing software later. The toolbox usually includes a histogram tool, which can be helpful in avoiding clipping (loss of highlight or shadow information).

Film Profiles: These are presets that are configured according to a set of film characteristics that, when matched correctly, will generally save you work in color balance or black and white contrast adjustments later. Some software will have more extensive profiles than others, and they are worth exploring. Keep in mind that when you scan film you are dealing with a set of characteristics (color balance, contrast, white balance) that are, in effect, hard-boiled into the film itself. If you “fight’ these characteristics by having a generic or incorrect profile you are rowing against the tide and will have to do lots of work later, or not be able to get the scan right. This is especially important with negative film.

Some software packages have numerous profiles for many different film stocks and brands, in both black and white and color, and while not always spot on will at least put you in the ballpark. Or, you can experiment and mix and match and try different profiles and see what that gets you. As you do so you will be surprised at the varied results that are obtained. Because of its different “build”, Kodachrome film will generally require that you choose that profile rather than other types of slide film, which in more basic software can be simply a “slide film” generic profile.

Unsharp Masking: This curious phrase actually means sharpening, and most software has a default that you can change. This setting actually increases contrast at the pixel edge, thus giving the impression of enhanced sharpness. I generally keep it at the preset in the knowledge that I cannot effectively sharpen an unsharp image, although some images might benefit from increasing the sharpening strength. If there is a “Clarity” or “Structure” option it is, to me, a generally better way to enhance the look of sharpness in an image, as this helps avoid some of the “etched” look that overuse of Unsharp Masking imparts.

Dust and Scratch Removal: Dirt can easily embed itself in film emulsions, and short of rewashing the film (though that does not always work) the best way to help remove some of the objectionable stuff is to use this option. Note that this is not a “noise” reduction tool, which generally will soften the image. It works by scanning the image for anomalies and then placing that information into a fourth (aside form the three of RGB) layer, and then tossing that information out when the image is processing.

There are other options available, such as “multi-scanning,” “auto contrast detection and correction,” “grain reduction” and more that will be covered in the workflow section. Again, the sophistication of the scanner software, and your need to apply these changes during the scan, will determine how much you need or will use these advanced features.

Here's the input panel from Silverfast SE Plus, a comprehensive software that allows for many input and parameter options. Atop the panel are film selectors (note Kodachrome option); below that are file format, name and path inputs, and dpi. (Note: this screen is from a 4x5 color transparency scan so dpi is 1200 pip and file size output is 74.8MB). Also shown here are some parameter control options, which I will cover in the workflow sections. 

Final Thoughts on Software

The scanner’s optics, scan module, etc., are important, but if you know what the inputs do and set them correctly you will find that scanning is a fairly simple procedure. This may not feel so simple during your first few forays, but with practice and experience, will get you excellent scans in very short order.

In all, scanner software should help you solve certain problems that the image presents, although you may find, as I do, that some images are irredeemable. As you work, and especially as you edit, you will begin to recognize what can and cannot be accomplished, even with the most sophisticated controls.

This can be frustrating, but all told not as frustrating as banging your head against the wall of trying to rescue an irredeemable original image. While there are some images than can be scanned quickly and easily and be ready for whatever you have in mind for the image—a print, a web gallery or a custom book—others require more work. Some, however, may just be a lost cause. With that in mind I will address some typical problem children in the final section of this project and propose some scanner/image editing combinations that may bring them back from the brink, plus offer some advice about matters of discretion and valor.

Contact information for scanner software makers:

Canon drivers and support for Canon scanners:

www.usa.canon.com

Epson drivers and support for Epson scanners: www.epson.com

“Third Party” software dedicated to a variety of scanners, plus some support for discontinued scanners no longer supported by the original manufacturer:

SilverFast: www.silverfast.com

Vuescan Scanner Software: www.hamrick.com

Next posting: Scanning Workflow: Scanner Setup and Calibration

The Scanning Project-8: Scanner Terms and Important Specs

 There is no sense buying a scanner or making scans on a scanner that does not have the right tools for the work you intend to do. In this post I will cover the main specs to check and what I consider important benchmarks for a variety of projects you may have in mind. As an introduction to the terms, following is a brief description of each and why they are key elements in determining image quality. These will be covered more extensively within the context of the scanner workflow discussions in following posts.

Resolution: In essence, resolution is a prime determinant of how large you can create a print from the scanned image. Much like the megapixels in a digital camera, the larger the file produced the larger the potential enlarge-ability. Of course, other matters come into play, including the quality of the scanner lens and sensor, but given all other things are equal (which is rare) the higher the resolution you choose the bigger the file produced, thus the greater degree of enlargement.

Scanner resolution is expressed as pixels (or dots) per inch. The important thing to watch for is that the resolution is expressed as Optical Resolution. Some scanners are misleadingly labeled as having high resolution when actually what is being stated is the potential interpolated, or resampled resolution capability. This means the image is crunched, if you will, to extrapolate a higher resolution than the actual optical resolution.

This is an image size dialog box from a scanner 35mm slide that was cropped slightly in scanning. The scan was made at 3200 dpi. The dialog box on top shows the scan when it has been converted to printing resolution, resulting in an 11x16 image size. Note that this can be edged up a bit using resampling at this stage, a topic covered in the workflow sections in later posts. 

Simply put, the higher the optical resolution the larger the image file. When selecting a scanner make sure it has a minimum of 4800 dpi; 6400 dpi scanners are becoming more affordable and are a good choice if you work mostly from 35mm film. But keep in mind that when scanning at 6400 dpi every sharpness and other flaw in the original will become quite apparent, like looking at yourself in a magnifying mirror in the morning. In addition, scanning at 6400 dpi can result in some very large image files, perhaps beyond your needs. It also can point out flaws in the lens that you used to make the photo that might not be apparent even when viewing the film through an 8X loupe.

Here's a scan from a 6x7 medium format negative. Note the larger image print size that can be achieved. This scan was initially made at 3200 dpi.

Bit depth: Again, as with digital cameras, you can choose the bit depth of the image, which means how many bits of information are captured within the three color channels of the sensor. You often have a choice of bit depths, such as 8-, 24-, 36- and in some scanners 48-bit.

Think of the difference between 16-bit RAW file and 8-bit JPEG images made in your digital camera. The 16-bit file simply has more image information available, which means you get a lot more potential out of the scan. But just as with resolution, the higher the bit depth the larger the image file, so consider the tradeoffs. For the most part, 36-bit will do the job, and for some end uses 24-bit and even 8-bit (for black and white images for web) may do just fine.

Dynamic Range: This is one of the main scanner specs to check. Dynamic range is a term you might be familiar with in the context of your digital camera. At the camera’s lowest ISO settings that range might be 10-11 f-stops, meaning that tonal values within that span can be recorded; the dynamic range of any camera inevitably falls as you raise ISO. In scanners, the measure is not f-stops but in something called Optical Density and is within a scale of 0.0 (white) to 4.0 (black).

Watch for how the scanner’s specifications (read capabilities) are expressed in Optical Density terms. A scanner that’s Optical Density falls between 2.0 and 3.0 may work for some prints and “quick” tasks, but generally there will be a loss of highlight and deeper shadow information—in other words, it is quite flat. Scanners in the 3.2 to 4.0 range are more suitable for the kind of work you might be interested in, with the higher number offering a better dynamic range capability. In other words, the higher Optical Density rating will bring out the most tonal (thus color richness as well) qualities of the image.

Flatbed or Dedicated Film Scanner?

There are two main types of scanners for photographers and those working with photographic images. One is a flatbed that can handle most film formats (35mm up to 8x10) and prints up to the platen size, the most common being 8.5 x 11”. Flatbeds can also be used to scan tintypes, daguerreotypes and glass plate negatives. A flatbed can be versatile, but if you have only 35mmn prints and negatives a better choice would be a dedicated film format scanner, commonly for 35mm but also available for medium format (120) film. 120 film scanners can cover all the 120 formats, including 6x6, 6x9 and even 6x17 negatives and slides. (Larger format dedicated scanners are strictly for professionals and will not be covered in this project.) Note that flatbeds can usually do a good job with 120 format and a reasonable job with film as well. How well depends on the scanner’s specs and build.

Thus, the scanner you choose is highly dependent on the type of images you want to scan. If you are a family photographer with lots of old snapshots and prints and only a few boxes of 35mm film, go for the flatbed. If your collection is primarily composed of 35mm film then go with a dedicated film scanner.

Quick Guide: Scanner Specs for Film and Prints

Here is a quick rundown of the scanner specs I believe are best for your work. Of course, budget and the volume of work you plan to scan should guide you, but scanning via a low-spec scanner is generally a waste of your time.

Optical Resolution: 4800 dpi; better: 6400 dpi

Color Bit Depth: maximum, 48-bits per pixel, 36-bit is usually fine

Grayscale Bit Depth: 16-bits per pixel

Optical Density: 3.4 minimum; best: 4.0

Light Source: LED

Platen Size (for prints): 8x10”; better: 8.5x11”

Film Holders and Masks: Dependent upon your formats, 35mm to 4x5” film

Bundled Software: Covered in the next posting

Next posting: Scanner Software

The Scanning Project-7: How a Scanner Works

While this may be purely of academic interest, I thought it would be a good idea to demystify scanner mechanics a bit. Think of a scanner as a potentially high megapixel imaging device that converts image information from film or prints to a digital file. Just as in a digital camera, the image can be manipulated during the conversion process and given certain attributes, such as correction of color and enhancement through contrast and saturation choices.

For those who have not worked with a digital camera a scanner is akin to a copier. But the scanner does not have toner or nozzles to lay down the copied information; it creates digital image information that can be manipulated to mimic the copied image or to enhance or adjust as needed.

This Epson 850V scanner scans both prints and film using a flatbed design. This illustration shows slides in the film holder, which is then placed directly on top of the platen. 

In essence, a scanner contains an RGB sensor, just as in a digital camera that, in flatbeds, sits underneath a glass covering onto which the material is placed. Flatbed scanners have both fixed and movable mirrors and a movable light source. The movable mirror and light scan across the surface of the image and direct the results through a lens to the fixed mirror, which directs it to the RGB sensor. In essence, it “writes” the information as it goes. Depending on the quality of the scanner, the light source in a flatbed can be LEDs or some variety of a tube of light.

Film scanners differ slightly in how the image is captured. Strips of film or mounted slides are put into a holder that is then inserted into a slot in the scanner. In a flatbed the film is placed onto the glass platen within holders. When an image is selected for scanning in a dedicated scanner a stepper motor moves the frame across a lens that directs the image to the sensor.

Here's a Plustek dedicated 6x6cm film scanner. Frames and strips are placed into a holder that is then inserted into the film gate, which then "steps" the image across the scanning module. 

While the mechanics of a scanner are fairly straightforward, the software and capabilities of the sensor can vary considerably, depending on price and manufacturer. In the next posting I will offer some criteria that should be used to choose a particular scanner for the work you have in your collections. Scanner specs are important to understand as they will determine what you can and cannot accomplish in your work.

Every scanner works in basically the same fashion and there are a number of steps required prior to making the final scan. The first is a preview, a sort of large thumbnail (not full resolution) image, often called a “prescan.” While it serves as a rough guide to the image it should not be taken as what you could or should expect from the final scan, just as the image review on your digital camera’s LCD is certainly not what you will achieve after image processing later.

Once you have the prescan on the screen you can make various adjustments. The heart of the scanning process is the software through which you process the image. This involves choosing the resolution, the bit depth, noise reduction, dirt and scratch elimination, dynamic range, color balance and more. These choices will be examined in detail in the scanner workflow postings of this project.

Here's a screen grab of Epson's scanner software with many of the control modules opened. Image controls in software can be basic or quite sophisticated, but most allow you to make the kind of adjustments you need to create a good quality image file from the film or print you are scanning.

The changes you make to the prescan is where you set up the parameters of the scanned image, much as you set up the image-processor in a camera to deliver a certain look and resolution of a captured image. Scanning software can be quite sophisticated, and learning about its many options is key to creating quality image files from the original material.

By understanding what a scanner can deliver, and what program to utilize to get the best possible results, you will be well on the way to making the right buying decision and accomplishing your goal of archiving your precious film and print images.

Next posting: Scanner Specs