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| scanning-standards [2020/10/18 06:50] – old revision restored (2020/09/11 14:33) 108.162.219.207 | scanning-standards [2022/05/12 12:57] (current) – [IT8 Calibration] jonasrosland |
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| ===== DPI ===== | ===== DPI ===== |
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| %%Arguably the most important part of scanning is getting a high enough level of DPI. For true archival scans you want to get 1200DPI if at all possible. This may be considered overkill for most uses however it has a major plus in that is that it allows for easy touch-up and repair for damaged boxes etc. which almost everything we scan will have some damage. If we go slightly overboard with DPI it is unlikely that we would be need to scan the item again down the road. Most low-end scanners are unfortunately unable to properly go above 600DPI. That will not stop most from claiming they can however, which is unfortunate as they can introduce artifacts that can will ruin you scans. Refer to the section on %%[[https://scanning.guide/getting-started/what-and-where-to-buy|what and where to buy]] %%for more information.%% | %%Arguably the most important part of scanning is getting a high enough level of DPI. For true archival scans you want to get 1200DPI if at all possible. This may be considered overkill for most uses however it has a major plus in that is that it allows for easier touch-up and repair for damaged boxes etc. which almost everything we scan will have some damage. If we go slightly overboard with DPI it is unlikely that we would be need to scan the item again down the road. Most low-end scanners are unfortunately unable to properly go above 600DPI. That will not stop most from claiming they can however, which is unfortunate as they can introduce artifacts that can will ruin you scans. Refer to the section on %%[[https://scanning.guide/getting-started/what-and-where-to-buy|what and where to buy]] %%for more information.%% |
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| ===== 48-Bit Vs. 24-Bit Color (The Great Debate) ===== | ===== 48-Bit Vs. 24-Bit Color (The Great Debate) ===== |
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| %%NOTE - You’ll see 48-bit referred to as 16-bit and 24-bit referred to as 8-bit depending on where you look. In Photoshop for example it’s 8 and 16. So just note that in your head when you read about this stuff that 48=16 and 24=8.%% | //NOTE - You’ll see 48-bit referred to as 16-bit and 24-bit referred to as 8-bit depending on where you look. In Photoshop for example it’s 8 and 16. So just note that in your head when you read about this stuff that 48=16 and 24=8.// |
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| %%For most purposes, outside of photographs or slides, 24-bit color is very likely sufficient for your scans. You are more than welcome to scan at 48-bit just to be safe, and in fact the original scanning guide from 2018 encouraged this. After research and discussion we’ve had a change of heart on the issue. It’s very unlikely that your scans contain any more useful information with 48-bit than they would with 24-bit, and doing 48-bit greatly increases file size as well as introduces compatibility issues in certain image viewers, and can make it difficult to work with histograms if they're 48-bit RAW scans from the Vuescan software.%% | For most purposes, outside of photographs or slides, 24-bit color is very likely sufficient for your scans. You are more than welcome to scan at 48-bit just to be safe, and in fact the original scanning guide from 2018 encouraged this. After research and discussion we’ve had a change of heart on the issue. It’s very unlikely that your scans contain any more useful information with 48-bit than they would with 24-bit, and doing 48-bit greatly increases file size as well as introduces compatibility issues in certain image viewers. They also can make it difficult to work with your images if scanned in 48-Bit in Vuescan due to it forcing them to become linear scans (Very dark scan images really just meant for slides) unless IT8 Calibrated. |
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| %%You can test this by scanning your image in both 24-bit and 48-bit; do you see a difference? You most likely won’t due to the fact that very few things can print or view 48-bit images including your monitor or printer. Most of the items that we scan were not screen printed in 48-bit back when they were created either, so using 24-bit is fine.%% | Another thing to realize is you aren't going to get any more actual discernible colors out of your scan by going 48-bit. You can test this by scanning your image in both 24-bit and 48-bit; do you see a difference? You shouldn't due to the fact that very few things can print or view 48-bit images including your monitor or printer. It wouldn't matter even if you could because you're not going to pick up additional colors due to these being printed originally with 24-bit printers at most. |
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| %%That’s not to say 48-bit is not without merit. One purpose of 48-bit is to primarily reduce banding in smooth vignette/gradients while scanning film and photos. However the vast majority of video game media (boxes, manuals, posters, labels etc.) were screen printed which means the artwork consists of CMYK dots. These are solid color dots mixed together which don’t produce vignettes/gradients. If you zoom in on a 1200DPI scan at 100% you can easily make out the dots. A zoomed in 1200DPI scan will look a lot like what you’d see with a microscope on the physical item you’re scanning, see example below:%% | That’s not to say 48-bit is not without merit. One purpose of 48-bit is to primarily reduce banding in smooth vignette/gradients while scanning film and photos when doing edits in Photoshop etc. However the vast majority of video game media (boxes, manuals, posters, labels etc.) were screen printed which means the artwork consists of CMYK dots. These are solid color dots mixed together which don’t produce vignettes/gradients. If you zoom in on a 1200DPI scan at 100% you can easily make out the dots. A zoomed in 1200DPI scan will look a lot like what you’d see with a microscope on the physical item you’re scanning, see example below: |
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| {{ :getting-started:cmyk_closeup.jpg?400&direct |By Psiĥedelisto - Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=66759794}} | {{ :getting-started:cmyk_closeup.jpg?400&direct |By Psiĥedelisto - Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=66759794}} |
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| %%Another argument for 48-bit depth is the fact that you get a much “wider” histogram to work with. For more information on histograms, see the [[post_production_editing|Post Production/Editing]] section of this guide. While this is true, we should ask is this useful? It can potentially be when doing drastic color edits such as correcting something sun faded. But more than likely we won’t be scanning very damaged material unless it’s extremely rare and the only likely access we’ll have to something. If it’s something we can get another copy of without much work its better just to scan a better quality copy. Basically, if we’re scanning something in good shape VERY drastic edits won’t be necessary and therefore a 48-bit histogram is unnecessary as well.%% | Another argument for 48-bit depth is the fact that you get a much “wider” histogram to work with. For more information on histograms, see the [[/post_production_editing|Post Production/Editing]] section of this guide. While this is true, we should ask is this useful? For the sake of argument it can potentially be when doing drastic color edits such as correcting something sun faded or in need of major color corrections. But more than likely we won’t be scanning very damaged material unless it’s extremely rare and the only likely access we’ll have to something. If it’s something we can get another copy of without much work its better just to scan a better quality copy. Basically, if we’re scanning something in good shape VERY drastic edits won’t be necessary and therefore a 48-bit histogram is unnecessary as well. |
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| Because of the reasons above it is fine is your scans are in 24-bit, and it won't hurt anything for them to be in 48-bit either (in most cases). But again with 48-bit you're likely unnecessarily increasing your file sizes drastically and complicating scanning and cleanup workflows. | Because of the reasons above it is fine is your scans are in 24-bit, though you can still do them in 48-bit and it's fine, just be aware it will cause larger file sizes, application incompatibilities, and more complex workflows for likely little to no benefit. |
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| ===== IT8 Calibration ===== | ===== IT8 Calibration ===== |
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| %%We do not require but **STRONGLY** recommend IT8 Calibration which we discuss in-depth in the [[calibration:why-is-this-important|Calibration]] section of this scanning guide. Basically you purchase an IT8 card that you then scan, and finally run that scan through a program that will create a profile for your scanner. This profile will automatically color correct your scans when attached to them as long as you scan them in with the same settings that you scanned in the IT8 card. It’s an excellent way to get an accurate baseline for all your scans and make them require much less work in the post-editing phase.%% | We do not require but **STRONGLY** recommend IT8 Calibration which we discuss in-depth in the [[why-calibration-is-important|Calibration]] section of this scanning guide. Basically you purchase an IT8 card that you then scan, and finally run that scan through a program that will create a profile for your scanner. This profile will automatically color correct your scans when attached to them as long as you scan them in with the same settings that you scanned in the IT8 card. It’s an excellent way to get an accurate baseline for all your scans and make them require much less work in the post-editing phase. |
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| %%If you’re unable to do IT8 Calibration it will really just be a trial and error of sorts with your scanner. We would strongly recommend scanning in RAW still if down the road you decide to profile your scanner, while also scanning using the built in scanner software (from Epson, Canon etc), as it will likely do a decent job making your scans look good. This usually boils down to using the default “Photo” settings of your scanning software. In the guides you’ll see when we configure scanning software we turn off all these settings due to the fact that we do IT8 calibration and we want a constant baseline. But if you’re following the guides without calibration, your scans will look flat and dull without an IT8 profile attached so in that case it’s likely best to use your standard scanning software settings.%% | IT8 Calibration however does make your workflow more complex slightly, and you'll also need to invest in an IT8 card and learn how to calibrate it with software. So if you don't want to mess with that route you can still produce good scans generally with your scanning software that comes with your scanner. Generally the default options produce good color results but you should experiment. Either way make sure you turn off enhancements such as Descreening, Unsharp Mask, Dust Removal etc. If you think you might do IT8 Calibration at some point you should consider scanning your items twice. Once with your default scanner color settings you've tested in your scanning software, and then once with scanning settings which will produce a "flat" file that looks dull but when an IT8 profile is attached to will have color correction applied making it look good. If you visit the Software sections on the left side you can find out how to to configure it properly for scans with various scanning software we have experienced with. Again to be clear if you are NOT going to ever do IT8 calibration do not create "flat" scans as they will be difficult to get to look good versus just doing a standard scan from your software. Lastly if you're scanning without IT8, please use the vendor provided scanning software from your scanner manufacturer instead of Vuescan, as they have delivered better results in our testing likely due to being optimized for the hardware you purchased and it will be free! |
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| __Note: If you're scanning in "Photo" mode, please use the provided scanning tools from your scanner manufacturer instead of Vuescan, as they have delivered better results in our testing.__ | |
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| ===== Flattening ===== | ===== Flattening ===== |
| The **Tiffen/Kodak Q-13 Color Separation Guides** are commonly used with photographs and some scanning for archival purposes. They can be purchased from the web through [[https://www.amazon.com/Tiffen-Color-Separation-Guide-Scale/dp/B00009R7GB|Amazon]] and other place, and while not required sometimes people scanning items will include them along with their scans. They allow for color referencing to be done which can be useful when scans are edited and re-used. That being said this isn't a required step and a lot of people don't include them with their scans currently. For example if you're trying to decide on spending your money on an IT8 calibration card or a Tiffen Q-13, go with the IT8 calibration card as the benefits are immediate. Consider the Tiffen Q-13 a nice but not necessary thing you can include with your scans. | The **Tiffen/Kodak Q-13 Color Separation Guides** are commonly used with photographs and some scanning for archival purposes. They can be purchased from the web through [[https://www.amazon.com/Tiffen-Color-Separation-Guide-Scale/dp/B00009R7GB|Amazon]] and other place, and while not required sometimes people scanning items will include them along with their scans. They allow for color referencing to be done which can be useful when scans are edited and re-used. That being said this isn't a required step and a lot of people don't include them with their scans currently. For example if you're trying to decide on spending your money on an IT8 calibration card or a Tiffen Q-13, go with the IT8 calibration card as the benefits are immediate. Consider the Tiffen Q-13 a nice but not necessary thing you can include with your scans. |
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| How do you include it? Well you scan it! There's debate on how to do this and we'll leave it up to you to decide. Some people include the Q-13 with every scan, which makes it easy to find and use but can also complicate fitting it along with the item you're trying to scan on the scanner. Another method is to simply scan the Q-13 guide separately as its own image and label it with a date and include it with your scan. | How do you include it? Well you scan it! There's debate on how to do this and we'll leave it up to you to decide. Some people include the Q-13 with every scan, which makes it easy to find and use but can also complicate fitting it along with the item you're trying to scan on the scanner. It also increases your file sizes due to the fact of making each scan larger dimension wise. Another method is to simply scan the Q-13 guide separately as its own image and label it with a date and include it with your batch of scans as a separate file. |
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| The Q-13's do have a finite life, so you'll likely need to replace it if you scan a lot, maybe once or twice a year if you're scanning hundreds of items. | The Q-13's do have a finite life, so you'll likely need to replace it if you scan a lot, maybe once or twice a year if you're scanning hundreds of items. |
| ===== What is a RAW File? ===== | ===== What is a RAW File? ===== |
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| You'll see that we refer to scanned files as RAW quite often. This basically just means that the scans we create are completely untouched except with easily reversible changes that don't result in ANY quality loss. When we scan images we make sure we don't aggressively crop and cut off parts of what we're scanning, it's best to always leave a small border around the image so nothing is lost. We don't straighten our RAW images in Photoshop or any other software suites (outside of **lossless** 90 degree rotations) as it will alter the scan. We basically only attach an IT8 profile if we have one, and save it to either ZIP compressed TIFF Format or as a PNG. We want our RAW files to be lossless and as pristine as possible. | You'll see that we refer to scanned files as RAW quite often. This basically just means that the scans we create are completely untouched except with easily reversible changes that don't result in ANY quality loss. It's a pristine no frills straight from the scanner image which provides us with a consistent baseline to start from. When we scan images we make sure we don't aggressively crop and cut off parts of what we're scanning, it's best to always leave a small border around the image so nothing is lost. We don't straighten our RAW images in Photoshop or any other software suites (outside of **lossless** 90 degree rotations) as it will alter the scan. We basically only attach an IT8 profile if we have one, and save it to either ZIP compressed TIFF Format or as a PNG. We want our RAW files to be lossless and as pristine as possible. |
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| ===== What quality should I choose? ===== | ===== What quality should I choose? ===== |