Hi Nikhil, some thoughts along the line
* In https://github.com/sgoeschl/java-image-processing-survival-guide/tree/master/code/jipsg you find code resizing/resampling of images with a lot of open source libraries * The library being used depends on the range of source images - how many image formats, image sources, etc. * Stay clear of TIFF if possible and PDF scans - will cause endless grief * Personally I would use https://github.com/haraldk/TwelveMonkeys and Thumbnailator Thanks in advance, Siegfried Goeschl Disclaimer: I’m sort of affiliated with the “TwelveMonkeys” library since Harald Kuhr (the creator of the library) is a friend of mine and we did a couple of presentations together > On 6 Mar 2017, at 04:52, Nikhil <nikhilmac...@gmail.com> wrote: > > Thanks Siegfried. Your github details are really good. It gave a lot of > details but also confused me to find the optimal production ready approach > for the problem. Could you pls. guide me here ? > > Here are the few usecases that I have, > 1. Convert JPEG to PNG either color or grayscale depending upon the source > image color. (I believe I need utility to find the source image color e.g. > if image is already B/W , Grayscale or Color ) > 2. Update metadata and also resize the image to new dpi e.g. if source > image is 1200x1200 then upon conversion to PNG it should be 300x300 dpi > with same physical size. > > What would be best library to use for above usecases ? (I believe java > imageIO should be good enough for these tasks...correct ?) > What should be the steps to do above two usecases ? > > Thanks for your help. Appreciate it a lot ! > > Thanks, > Nikhil > > > On Sun, Mar 5, 2017 at 8:53 AM, Siegfried Goeschl < > siegfried.goes...@it20one.com> wrote: > >> Hi Nikhil, >> >> I do not know commons-image good enough to answer your questions but >> >> * Do you mean changing the DPI value (metadata only) or resizing the image? >> * While not related to Apache Commons Image the following link might help >> - https://github.com/sgoeschl/java-image-processing-survival-guide < >> https://github.com/sgoeschl/java-image-processing-survival-guide> >> >> Thanks in advance, >> >> Siegfried Goeschl >> >> >>> On 3 Mar 2017, at 07:53, Nikhil <nikhilmac...@gmail.com> wrote: >>> >>> Hi, >>> >>> >>> 1. Does Commons Imaging support changing dpi of an image ? E.g. Changing >>> 1200x1200 image (jpeg / png) to 300x300. >>> >>> If yes, could you point me to a sample ? >>> >>> 2. Can Image be converted to grayscale 4 bit or 8 bit using the Imaging >> api >>> ? If yes, could you point me to a sample ? >>> >>> >>> Thanks, >>> >>> Nikhil >> >> --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
