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Photo Forum / General Photo Topics / General Topics / March 2008How do I batch change photo DPI settings
My dumb OCR software will refuse to OCR an image if it's lower than a 96 dpi setting in it's properties. It doesn't care that the pixel dimentions are much higher than some other much smaller pixel dimention file if it's properties say it's dpi is under 96 dpi. So, how can I batch change many image files (usually JPEG's) to a particular dpi property setting? I'm using Omipage Pro 14 to do the OCR. Thanks. > My dumb OCR software will refuse to OCR an image if it's lower than a 96 > dpi setting in it's properties. [quoted text clipped - 8 lines] > > Thanks. Image Magick >> My dumb OCR software will refuse to OCR an image if it's lower than a 96 >> dpi setting in it's properties. [quoted text clipped - 10 lines] > > Image Magick Where do you dowload it? I tried to find where, but all I found were sites that try to get you do do anything but let you download it. I only found link to some dossy directory of about 100 programmers code files. > My dumb OCR software will refuse to OCR an image if it's lower than a 96 dpi > setting in it's properties. [quoted text clipped - 6 lines] > > I'm using Omipage Pro 14 to do the OCR. Irfanview >> My dumb OCR software will refuse to OCR an image if it's lower than a 96 >> dpi setting in it's properties. [quoted text clipped - 8 lines] > > Irfanview Thanks! Irfanview sounded familiar. Turns out I already had it installed. It only took a few minutes to figure out how to batch reset the DPI's in my files. Funny that it always compresses the files to about only 27% of the original size. I would prefer that it left the file quality alone. I'm only resetting the DPI numbers. I experimented with resetting to 3 different DPI's: from the original 72 DPI, to 96, 300, and 600. The resulting new files are all exactly the same NEW size regardless of which of those 3 DPI's I reset the files to. Am I just unaware that I chose some compression unintentionally? Couldn't find anything about compression or image quality/resolution in the help file. >>> My dumb OCR software will refuse to OCR an image if it's lower than a 96 >>> dpi setting in it's properties. [quoted text clipped - 29 lines] > the > help file. Under the "options" button (right of the format pull down menu, but before "set advanced options") Unfortunately it is a slider bar 0-100 so you have to know what your compression is beforehand... Jim >>>> My dumb OCR software will refuse to OCR an image if it's lower than a >>>> 96 dpi setting in it's properties. [quoted text clipped - 36 lines] > > Jim Couldn't find any slider bar. Is it somewhere in the batch conversion dialog box? >>>>> My dumb OCR software will refuse to OCR an image if it's lower than a >>>>> 96 dpi setting in it's properties. [quoted text clipped - 40 lines] > Couldn't find any slider bar. > Is it somewhere in the batch conversion dialog box? Yes, near the bottom; next question is what version are you using? I'm looking at 3.91. >>>>>> My dumb OCR software will refuse to OCR an image if it's lower than a >>>>>> 96 dpi setting in it's properties. [quoted text clipped - 42 lines] > Yes, near the bottom; next question is what version are you using? I'm > looking at 3.91. 4.10 Don't see slider bar or a way to control compression any way at all. I'm not resizing of course. >>>>>>> My dumb OCR software will refuse to OCR an image if it's lower than >>>>>>> a 96 dpi setting in it's properties. [quoted text clipped - 45 lines] > 4.10 Don't see slider bar or a way to control compression any way at all. > I'm not resizing of course. I updated my Irfanview to 4.10 and he has moved some things around. It is in the Batch Conversion/Rename menu. The Options button, still next to the Output Format pull down menu. That should pull up a menu with the slider bar to set the JPEG compression. Jim >>>>>>>> My dumb OCR software will refuse to OCR an image if it's lower than >>>>>>>> a 96 dpi setting in it's properties. [quoted text clipped - 54 lines] > > Jim Thanks so much! I did a test on a couple of JPEGS with the slider set at 100%. The files were at 72 DPI and I set the DPI at 300 for the output. The resulting files were at the same quality and actually a tiny bit larger (by 2.7%) which is just fine. Funny, but if I reset the DPI of a TIFF file (the same as the JPEGS aforementioned), it would double the size of the file. I'm beginning to see that Irfanview has a lot more control options that I'm totally unaware of. I guess they offer this quite useful free program as a teaser to get a more powerful paid version. >>>>>>>>> My dumb OCR software will refuse to OCR an image if it's lower >>>>>>>>> than a 96 dpi setting in it's properties. [quoted text clipped - 66 lines] > I guess they offer this quite useful free program as a teaser to get a > more powerful paid version. I use Irfanview to do simple batch processing jobs and RawShooter and PhotoShop to do pretty much everything else. You can do a great deal with Irfanview if you fiddle with all the controls. There is no paid version this is the whole thing and it is simply amazing to me that he keeps putting the time and work into updating it. For "Free" it is an incredible tool. >>>>>>>>>> My dumb OCR software will refuse to OCR an image if it's lower >>>>>>>>>> than a 96 dpi setting in it's properties. [quoted text clipped - 74 lines] > to me that he keeps putting the time and work into updating it. For > "Free" it is an incredible tool. Amazing indeed. Maybe he needed software for his own projects but found what's available to be somewhat disappointing. Since he's a programmer also, he decided to create his own software and had the generous spirit to give it to anyone else who has similar needs. Of course that's only a guess. I'm grateful such altruistic people are still out there!!! > Amazing indeed. Maybe he needed software for his own projects but found > what's available to be somewhat disappointing. Since he's a programmer also, > he decided to create his own software and had the generous spirit to give it > to anyone else who has similar needs. Of course that's only a guess. I'm > grateful such altruistic people are still out there!!! ITYF he started it as a degree project and continued development when he left uni. Note that it's only free for non-commercial use - if you make money with it then so should he. >>>>> My dumb OCR software will refuse to OCR an image if it's lower than a >>>>> 96 dpi setting in it's properties. [quoted text clipped - 35 lines] > Couldn't find any slider bar. > Is it somewhere in the batch conversion dialog box? near the bottom of the batch dialogue: [JPG - JPEG FORMAT] [Options] [Set advanced options] ^^^^^^^^^ >>>>>> My dumb OCR software will refuse to OCR an image if it's lower than a >>>>>> 96 dpi setting in it's properties. [quoted text clipped - 41 lines] > [JPG - JPEG FORMAT] [Options] [Set advanced options] > ^^^^^^^^^ I'm using version 4.10 Don't see it. > Under the "options" button (right of the format pull down menu, but before > "set advanced options") Unfortunately it is a slider bar 0-100 so you have > to know what your compression is beforehand... Why? Set it to 100% and Irfan View will do lossless compression. Whatever lossy compression you did before will remain, because being lossy you can't undo it. |
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