cropping large images
John Rickman (71) 631 posts |
Can anyone suggest a native RISC OS app that will crop large jpegs without image deterioration? |
Raik (463) 2031 posts |
I use DPIngScan with my own settings (e.g. papersize A0, 99% jpeg quality…) to do this. |
Paul Sprangers (346) 493 posts |
So do I. It’s indispensable. |
John Rickman (71) 631 posts |
Raik and Paul thanks for pointing me at DPingScan it does the job perfectly. I can now stop trying to change JCut. It is written in BASIC but is very dense, no meaningful variable names or comments. |
Steve Pampling (1551) 7967 posts |
Source for this and Windows version available – check https://www.davidpilling.com/wiki/index.php/DPScan |
Steve Fryatt (216) 2056 posts |
It might be better to get the RISC OS version from Chris Johnson, as that’s a good five years newer than the version that David released the source for: http://www.chris-johnson.org.uk/software/dpscan.html |
Chris Johnson (125) 823 posts |
Indeed – I have made a number of additions. I have never got around to putting the source to my versions on my site (rather remiss) but if anyone would like the current source, drop me an email. I should point out that the original poster was enquiring about a lossless way to crop the image. Using DPScan to decompress, crop, recompress the image back to jpeg format is not lossless, since the recompression step will result in some loss in quality. My app TranJPEG will do a lossless crop, but there is no interface to allow an area to be dragged out on screen – you must know the coords of one corner of the ‘new’ area and the height and width of the cropped area. |