XnView Software

[+] 64 bit version, allowing bigger images to be processed (>50 MP) [!] improved compression with up to 30% for jpeg images [+] decoding support for jpeg images using arithmetic coding [+] improved PE security with DEP and ASLR [!] the AVX2 instruction set for the 64bit version should provide bette...

Danke for reporting back, Peter! @Pierre: What's the value range of nConvert's -q parameter (0-99 or 1-99 or 0-100 or 1-100) :?: Ranges of quality settings differ in each implementation, but the IJG values range from 99 (best) to 1 (worst). Please note that these are not percentages , nor is there a...

I apologize for hijacking your thread, Peter https://newsgroup.xnview.com/images/icons/smile/redface.gif The idea behind it is that I use "nconvert.exe" to add text in multiple lines. Because (at the moment) there is no multiline-feature, I have to repeat "write line - save jpg - write line - save ....

Compare the two images, is the lower image obviously quite unusable as predicted? Zooming in, it is possible to see some slight loss of quality, but doesn't the image above remain quite usable for any reasonable purpose? While the (loss in) quality may be acceptable to you and me, most serious phot...

Thank you very much, cday I'll get back to you ASAP!

The XnView file 'info' displays 'Subsampling', so in principle that could be read and an image resaved using Use estimated original quality (when possible) with the same subsampling, even if you say that is not implemented now? Could you please rephrase or elaborate on your question, cday? Filename...

And if Use estimated original quality (when possible) is used? 0.85*0.85*0.85 = 61%? Or close to no additional loss? It depends. Let's say your JPEG that was previously saved without chroma subsampling i.e. 1×1,1×1,1×1 (best quality) . Re-saving/re-encoding this JPEG with a SubSampling factor of 2×...

When I save a JPG file with "quality 100%", it results in an unmodified quality. This is a common misconception. Most of us had to learn the hard way that re-encoding a JPEG is always lossy. A Quality Setting of 100 Does Not Degrade an Image at All: False Saving an image to JPEG format always intro...

I'm always hoping for a "yes/no" answer and I'm always afraid when XnTriq starts his IKM (incredible knowledge machine). I'd love to give you a straightforward answer, but when it comes to JPEG, there's no one-size-fits-all solution. It's the nature of the beast :-| Initiating yet another BLS ( b i...

Useful software for analyzing and editing JPEGs: Independent JPEG Group jpg*dexe.zip = cjpeg/djpeg + rdjpgcom/wrjpgcom + jpegtran “Binaries for Win32 compatible systems of sample applications of the Independent JPEG Group's free JPEG software” Jpegcrop “The Jpegcrop Windows Application was initially...

Wikipedia: Although a JPEG file can be encoded in various ways, most commonly it is done with JFIF encoding. The encoding process consists of several steps: The representation of the colors in the image is converted to Y' C_B C_R , consisting of one luma component (Y'), representing brightness, and ...

XnTriq is, of course, the expert on all these matters... foxyshadis is our resident expert b/c she understands the math behind it :-) Forum references regarding the JFIF/JPEG file format: JPEG compression as lossless as possible Standard Values for JPG-Compression and EXIF/IPTC settings a picture p...

stickynoteme's source.jpg converted to PNG and downsampled from 447×447 to 333×333 pixels with… XnView Classic (Bilinear + Lanczos) XnView MP (Lanczos) XnConvert (Lanczos) nConvert (Lanczos) PhotoFiltre (Lanczos) IrfanView (Lanczos) FastStone Image Viewer (Lanczos3 + Lanczos2) Photoshop CS2 (Bicubic...

Lanczos3 is available in XnView/NConvert, so i can add it easily in GFL SDK & GFLAx. -rtype : Type of resampling quick : Quick resize linear : Bi-linear (linear) hermite : Hermite gaussian : Gaussian bell : Bell bspline : Bspline mitchell : Mitchell lanczos : Lanczos -sharpen percent : Sharpen (1.....