Sorry, I meant "since you apparently ARE using these for screen..."
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Upscaling JPEG's to 200 DPI and converting to Tiff - whats the best way to approach this?
Hi folks,
I have around 100,000 JPG scanned documents ranging from 75dpi - 100 dpi from a legacy application. I need to convert these to a 200dpi black and white Tiffs but any methods I've tried so far are leaving me with scans that are pretty illegible and not of a sufficient quality. In the new version of the application, the documents are scanned at 200 dpi and converted to B&W tiff using Able Batch converter and look perfect - but the question i'm asking is how can I upscale the old JPEG's and convert to black and white tiffs with a minimal loss of quality? Do I convert to tiff and then upscale, or is it better to upscale before conversion to TIFF?
Obviously I know that i'm not going to get the same quality as the 200dpi scanned jpegs, but so long as the resulting file is a 200dpi black and white TIFF I'll be able to put it into production...
Thanks guys, all help appreciated.
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Answers
Some softwares use better resampling algorithms than others. The problems that you're running into might be a limitation of the software. In general it's better to re-size first, then save as. It's worth trying both ways to see...
If you have Photoshop, you can not only adjust the resolution, but you can create custom actions to fit the processing of your scans. I took an online math class awhile back where my homework needed to be scanned and e-mailed to the instructor. I found a series of adjustments that worked well to take a scan using the scanner's default settings and turn it into a good quality image at an e-mail friendly resolution. Once I figured out the adjustments needed (adjusting size, brightness, contrast, etc...) to get the best quality image, I created an action in Photoshop to automate the process for future scans.
You could easily take a few of your images into Photoshop, and figure out the right combination of "tweaks" to get them looking good, then create an action. From there you can batch process your images applying that custom action. (In Photoshop: File-->Automate-->Batch)
Here's an article that should be helpful: http://digitalproducer.dig
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by: image_magicianPosted on 2009-02-05 at 08:07:51ID: 23560701
You certainly can upscale a JPG from 75 dpi to 200 without a problem. As you state, you will not get additional resolution because you cannot create detail that is not already there. However, scaling up a 75-100 dpi image to 200 dpi won't have significant visual issues, and since you apparently are not using these for screen and not print reproduction (since even 200 dpi would be too low for print) then your image quality should suffice.
It doesn't matter if you convert to TIFF first. The resampling will react the same either way.
In Photoshop, you simply choose "Image/Image Size..." (CTRL-i in Windows. Probably CMD-i on a Mac). There you will get two sections: Pixel Size and Document Size. Below them, you will have three checkboxes: scale styles, constrain proportions, and resample image. Make sure that "resample image" is checked. Then,in the Document Size area, change the Resolution to 200 (make sure that the drop-down next to it says "pixels/inch"). Then click okay.
After adjusting the resolution, you can then select "File/Save As..." and specify TIFF in the file type drop down menu.
It sounds like you have to handle this process manually. One thing that is helpful in Photoshop is the use of the Actions palette. Here you can record your DPI resampling for one image and attach a function key to the action. That way, each additional photo can be instantly resampled by opening the file, hitting the function key you defined (like F5) then you are free to do Save As.
To record your actions, open a file and have it ready. Then, in the Actions palette, click the icon for "create new action". Name your action and select your function key, then hit "record". From here on out, all your changes will be recorded. Once you have resampled your image, hit the "stop" icon in the Actions palette. Unfortunately, you cannot automate the save process since you have to manually provide a name for each file, but at least you can limit your steps for resampling.
Good luck!