Reducing jpg

VBForums Visual Basic Visual Basic 6 and Earlier [RESOLVED] how to reduce jpg filesize without reducing dimension Aug 8th, 2010, 09:07 AM #1 Thread Starter Fanatic Member Thread Starter--> [RESOLVED] how to reduce jpg filesize without reducing dimension Hello guys,Is there anyway to reduce jpg filesize ether by compression or color reduction to 256 color or Both.AM guessing GDI will be involved, but I don't know how to do thisany ideas. Aug 8th, 2010, 09:29 AM #2 Addicted Member Re: how to reduce jpg filesize without reducing dimension What are you using now to create/save JPEG's? Aug 8th, 2010, 10:30 AM #3 Re: how to reduce jpg filesize without reducing dimension JPEG can't have 256 colors, unless it is a black'n'white JPEG. The file format does not use palettes. So that will not be a solution if you want a JPEG file. PNG is far superior for paletted and/or lossless images. The only advantage with GIF format over PNG is that it can produce smaller 1-bit images (ie. 2 colors only in the palette).Normally JPEG should compress pretty well. However digital cameras and such use, I guess, a lossless variant of JPEG which will result in a much bigger filesize – atleast the files are very huge when compared to normally saved 100% quality compressed JPEG.Anyway, giving the current code what you have for JPEGs will help a lot. If using an external DLL is a solution, then you may wish to have a look at vbAccelerator's article on JPG.My personal preference in quality for saving JPEG files is 93. For some reason higher settings sometimes result in an extra "line" appearing at the bottom edge of the picture, especially if it contains a lot of red. This seems to simply disappear when using quality 93. And this same seems to happen with both new & old software, so it may be an issue in JPEG encoding in general. Last edited by Merri; Aug 8th, 2010 at 10:35 AM. Aug 8th, 2010, 10:44 AM #4 Re: how to reduce jpg filesize without reducing dimension I believe you can do compression (and many other things) using the FreeImage library. You can download the wrapper code and dll from here. Aug 8th, 2010, 11:11 AM #5 Re: how to reduce jpg filesize without reducing dimension I also found a selfcontained JPEG parser class from PSC. It isn't fit for saving the files, but it is able to give detailed information of a JPEG file which can be used to find out reasons why a specific JPEG file is huge etc. (digital cameras also save a thumbnail into the JPEG file).There is also a CJPEGi class in PSC, which is a VB6 code only solution for compressing JPEG images. It probably could be optimized for speed a bit more, but being complex stuff it is unlikely to happen. Aug 8th, 2010, 11:17 AM #6 Re: how to reduce jpg filesize without reducing dimension You can also use Windows® Image Acquisition Automation Library v2.0

Thread Starter Fanatic Member Thread Starter--> Re: how to reduce jpg filesize without reducing dimension Thank you FireXtolBut for this project am doing, i need jpg onlyDo you know how to resize picturebox to the size of the image in it? Aug 9th, 2010, 05:09 AM #18 Re: how to reduce jpg filesize without reducing dimension Originally Posted by coolcurrent4u Thank you FireXtolBut for this project am doing, i need jpg onlyDo you know how to resize picturebox to the size of the image in it? Set the AutoSize property to True. Software I use and highly recommend: Opera, Miranda IM, Peerblock, Winamp, Unlocker Assistant, JoyToKey, Virtual CloneDrive, Secunia PSI, ExplorerXP, GOM Player, Real Alternative, Quicktime Alternative,Sumatra PDF, and non-freeware: Photoshop and VB6().My codebank: AllRGB, Rounded Rectangle(math), Binary Server, Buddy Paint, LoadPictureGDI+, System GUID/Volume Serial, HexToAsc, List all processes and their paths, quasiString matchingStrings(search, extraction, retrieval etc): Retrieve BBCode Link from HTML, RemoveBetween ()'s, strFindBetween(str1,str2), Insert text in HTML, HTML - GetSpanByID Aug 9th, 2010, 06:44 AM #19 Thread Starter Fanatic Member Thread Starter--> Re: how to reduce jpg filesize without reducing dimension AM getting an error.The picture is saved, but with extra regions around the pictureboxplease see the attached project.EDIT: I have reattached the project and included the missing files Last edited by coolcurrent4u; Aug 9th, 2010 at 07:25 PM. Aug 9th, 2010, 08:25 AM #20 Re: how to reduce jpg filesize without reducing dimension Just a generic FYI, the original screenshot in the sample happens to be by me, here is the original PNG:The size is 12.31 kB while the JPG made out of it is 27.47 kB – although it does have some extra area around it, but if that extra area was in the PNG it would be compressed by a very high ratio being a single color. Edit! I re-saved the PNG image as-is using a 93% quality for JPEG and the size is 37.4 kB – and JPEG is not perfect quality unlike the PNG.But what I do wonder is FireXtol's attached JPEG, because it is over 50 kB and it looks like very bad quality! Was it saved in bad quality first and then at 100% quality?Anyway, PNG is superior over JPG when it comes to screenshots of most websites, GUIs & other non-photolike content And the small filesize for the image above was achieved using PngOptimizer. Last edited by Merri; Aug 9th, 2010 at 08:32 AM. Aug 9th, 2010, 08:51 AM #21 Re: how to reduce jpg filesize without reducing dimension It's a PNG. I took a screenshot(1680x1050) and saved it at various settings(JPEG). The PNG is a cropped section of the screenshot(as even a 100% quality JPEG is lossy; I prefer lossless formats). Software I use and highly recommend: Opera, Miranda IM, Peerblock, Winamp, Unlocker Assistant, JoyToKey, Virtual CloneDrive, Secunia PSI, ExplorerXP, GOM Player, Real Alternative, Quicktime Alternative,Sumatra PDF, and non-freeware: Photoshop and VB6().My codebank: AllRGB, Rounded Rectangle(math), Binary Server, Buddy Paint, LoadPictureGDI+, System GUID/Volume Serial, HexToAsc, List all processes and

Who are not of their own discipline). An "80% quality" (like the one exemplified by La Volpe above), or a "75% quality", is fine with them (because it is the "make sense" one). And don't look down on GIF either. After more than 10 years it is still very much alive, but MNG which was once an all singing and all dancing marvel is basically dead, and I don't believe the animated PNG would ever really take off the ground either.PNG is excellent and I like it naturally. But let us cool down a bit for a moment, (a) those beautiful 32-BPP pictures are made by somebody else, how many of us have actually produced such a one ourselves (involving editing alpha channel values)? (b) What about the file size of a beautiful 32-BPP PNG. if we somehow need to convert a 32-BPP PNG to 8-BPP, would the resultant image be really okay? Last edited by petersen; Aug 9th, 2010 at 01:40 PM. Aug 9th, 2010, 01:45 PM #25 Thread Starter Fanatic Member Thread Starter--> Re: how to reduce jpg filesize without reducing dimension Wow so much information about images/pictures. Png is definately better. But I need jpg for several reasons best know to me.You guys sound as if jpg is going close to its grave!please did anybody help me look at the attached project and found any error(s)?Well for the freeimage library, i don't know if i can include it in a commercial app. If i devote time to using its function and later can't use it in a commercial app, it is then of no need or what do you guys think? Last edited by coolcurrent4u; Aug 9th, 2010 at 01:48 PM. Reason: typo Aug 9th, 2010, 01:49 PM #26 Re: how to reduce jpg filesize without reducing dimension Nah, you forget JPG is still the ideal format for photos and other images that do not need to be pixel perfect.(However, mostly because none of the great lossy formats that do exist is free. There is JPEG2000 for example that gives a lot better quality/compression ratio, but you need to pay a license to use it. Edit! Or Wikipedia states it should be license free. Hmmh, seems like there is "bad" information regarding it over the Internet. Also, the sample image doesn't give as good result as I'd have expected. Edit #2! Better comparisons) Last edited by Merri; Aug 9th, 2010 at 02:10 PM. Aug 9th, 2010, 01:50 PM #27 Re: how to reduce jpg filesize without reducing dimension There are other ways of creating JPGs without using FreeImage: Manually as Merri posted in #5 above, WIA? mentioned in #6 and GDI+. There's also an Intel DLL floating around on the web referenced in vbAccelerator's project (post #3 above). So you have plenty of options I would think. I doubt JPG is anywhere near death. Aug 9th, 2010, 01:57 PM #28 Thread Starter Fanatic Member Thread Starter--> Re: how to reduce jpg filesize without reducing dimension Originally Posted

Specific, mainly concerned about reducing filesize i'll check and see if the dimension is not reduced alsoMerriThanks for the tips about jps generally, but vbAccelerator just metioned a dll used in loading jpegs, not compression, or did i get it wrong?MartinLissFreeImage library would be an overkill for now as i just want to save in reduce filesize and same dimension. If i wanted to manipulate thje image, i'll use it.PetersenMust i use FreeImage library first to convert the image.dilettanteCan you provide some sample code that use at leat most of the features of WIA Aug 8th, 2010, 07:33 PM #12 Hyperactive Member Re: how to reduce jpg filesize without reducing dimension PetersenMust i use FreeImage library first to convert the image. Please see the revised text in my earlier posting (for a moment I forgot your aim was to reduce the file size -- I thought you were to save to JPG).It is not a must for you to use FreeImage, it is just an option. But, MartinLiss mentioned it not without a reason. To optimize the JPG colors to 8-BPP (in an attempt to reduce the file size), you need to know the processes, therefore I guess MartinLiss didn't want to complicate the matter for you. Last edited by petersen; Aug 8th, 2010 at 07:45 PM. Aug 8th, 2010, 07:46 PM #13 Re: how to reduce jpg filesize without reducing dimension It's not such a great idea to re-save a JPEG as JPEG, as there will be compounded degradation due to the lossy compression used. A better format would be PNG, as it uses lossless compression. Software I use and highly recommend: Opera, Miranda IM, Peerblock, Winamp, Unlocker Assistant, JoyToKey, Virtual CloneDrive, Secunia PSI, ExplorerXP, GOM Player, Real Alternative, Quicktime Alternative,Sumatra PDF, and non-freeware: Photoshop and VB6().My codebank: AllRGB, Rounded Rectangle(math), Binary Server, Buddy Paint, LoadPictureGDI+, System GUID/Volume Serial, HexToAsc, List all processes and their paths, quasiString matchingStrings(search, extraction, retrieval etc): Retrieve BBCode Link from HTML, RemoveBetween ()'s, strFindBetween(str1,str2), Insert text in HTML, HTML - GetSpanByID Aug 8th, 2010, 08:59 PM #14 Addicted Member Re: how to reduce jpg filesize without reducing dimension Hey Cool:Did you try the SaveAsImage routine I sent you? It does not affect the dimensions of the image, only the compression/quality level.FireXtol is correct about repeated savings of a JPEG. Sometimes, however, it doesn't matter, depending on what you are using the JPEG for and how the original was created. If the JPEG is largely for viewing on a typical computer monitor, the lossy degradation is barely perceptible to the user.Tom Aug 9th, 2010, 01:35 AM #15 Thread Starter Fanatic Member Thread Starter--> Re: how to reduce jpg filesize without reducing dimension Originally Posted by Tom Moran Hey Cool:I see you received lots of good suggestions for dealing with JPEG files. All this may be a bit of overkill if all you want to do is save & reduce the size of JPEG files.Attached is a short and, very sweet, basic module that gives you

Their paths, quasiString matchingStrings(search, extraction, retrieval etc): Retrieve BBCode Link from HTML, RemoveBetween ()'s, strFindBetween(str1,str2), Insert text in HTML, HTML - GetSpanByID Aug 9th, 2010, 09:01 AM #22 Re: how to reduce jpg filesize without reducing dimension So the consensus from what I gather is there isn't much one can do with a JPG other than possibly saving the screenshot to a grayscale/256 color bitmap and seeing if that will be smaller; appears it will be slightly.Here's some examples of a 1920x1200 screenshot1. JPG full color: 355k (80% quality using GDI+)2. JPG grayscale: 288k (80% quality using GDI+)3. PNG full color (using GDI+): 1.7mb4. GIF: 289kNote about #3. GDI+ PNG compression uses only 1 algorithm & a couple bit-depths, I believe. There are 5 or 6 algorithms that PNG supports & several bit-depth formats but requires either 3rd party DLLs to use them or manually processing/writing pixels to PNG format. Last edited by LaVolpe; Aug 9th, 2010 at 09:27 AM. Reason: typo Aug 9th, 2010, 09:45 AM #23 Re: how to reduce jpg filesize without reducing dimension Originally Posted by petersen It is interesting that MartinLiss has mentioned FreeImage. FreeImage is indeed good stuff (albeit outstanding bugs) and I use it sparingly, e.g. to deal with multi-page TIFF, J2K/JP2 and camera raw formats, etc. It is extremely efficient in terms of speed. I tested it on 1, 2, 4, 8, 16, 24, 32, 48, 64-BPP PNGs alright (I don't use it for PNG as e.g. it can't save "interlaced"; I use my own stuff). When it comes to MNG, since it can only handle 1st frame of MNG (and yet can load limited types of it), I suggested to them to dispense with LibMNG.dll (subsequently on their request I submitted my example to demonstrate how it is feasible and yet can load more types of MNG than it currently can, be it PNG or JNG stream).In case anyone is interested, I can show you how to use VB wrapper pointed by MartinLiss to load JPG and save to GIF/PNG with FreeImage. Although FreeImage has active forums, unfortunately VB is hardly an item there. You can also see how it can be used in my Picture/video Viewer. Aug 9th, 2010, 11:48 AM #24 Hyperactive Member Re: how to reduce jpg filesize without reducing dimension To MartinLiss:Thank you. I've fetched your v1.7.zip. From the outset, I can see that you had made a rather extensive use of FreeImage and your last update being in Feb this year is quite current. I surely will have a good look at it.To general:Each file format has its own merits and demerits. It is like C++ and NET/C guys shouldn't just say VB is no good.For your info, even professional radiology associations approved (the year before?) their members (radiologists) to archive their images in JPG despite its "lossy" status. Radiologists have DICOM format, but they also use images in JPG on daily basis (and they prefer grayscale over color; color ones are there to facilitate others

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