Search found 15 matches: jason summers

Searched query: jason summers

by jenderek
Tue Oct 29, 2019 5:05 pm
Forum: Classic - Suggestions
Topic: OS/2 BMP variant with 16 byte DIB header not recognized
Replies: 3
Views: 3385

example of OS/2 BMP variant with 16 byte DIB header

example of OS/2 BMP variant with 16 byte DIB header

Hello Pierre,
Sorry i have not see your request for an example in the past.
So now i send an example pal8os2v2-16.bmp in appended archive
pal8os2v2-16.zip.
This example is also mentioned on Wikipedia about BMP file format.
This file is part of Jason Summers BMP test suite found as
archive bmpsuite-2.5.zip on site with URL:
http://entropymine.com/jason/bmpsuite/

The graphic tool IrfanView is able to open such BMP files and is able to
display example correctly.

I hope that this OS/2 variant will be implemented in a future version
of XnView tool.

Thanks
by XnTriq
Sun Dec 25, 2016 4:30 am
Forum: Classic - General Support
Topic: Addons -> PNGOUT
Replies: 14
Views: 3138

Re: Addons -> PNGOUT

SharkD wrote:Do you know which browsers support grayscale+alpha channel? Because even if XnView does not support it, it still might be a good idea to use it on my website.
They're widely used, …
… and all modern web browsers support them “out of the box”.
Can I use… ([url=http://www.caniuse.com/#feat=png-alpha]PNG alpha transparency[/url] » Known issues) wrote:IE7 & 8 do not support PNG's alpha transparency when you apply CSS alpha filter on them or a parent element.
Useful tools:
by XnTriq
Fri Sep 30, 2016 2:30 pm
Forum: MP - General Support
Topic: Settings for catalog and 'resample types' explain?
Replies: 2
Views: 1007

Re: Settings for catalog and 'resample types' explain?

XnTriq ([url=http://newsgroup.xnview.com/viewtopic.php?p=109743#p109743]bicubic resize ?[/url]) wrote:
Algorithms currently available in XnView v1.9 (Image » Resize):
  1. Nearest Neighbour
  2. Bilinear
  3. Hermite (Cubic Hermite spline?)
  4. Gaussian
  5. Bell
  6. Bspline
  7. Mitchell
  8. Lanczos (3-lobe)
  9. Hanning
foxyshadis ([url=http://newsgroup.xnview.com/viewtopic.php?t=3496]Info about Resampling algorithms[/url]) wrote:Mitchell is bicubic.

Agreed that some of the resizers aren't very useful. Could be worse, could be the full list of imagemagick resizers. :p Gauss, bell, and bspline are almost indistiguishable, and often only useful as specialized effects, not generic outputs; in general they're too close to bilinear to even matter. There are a wide range of bsplines but this one doesn't retain much sharpness. Hermite is practically indistiguishable from Mitchell - in fact it's one of the degenerate cases of the Mitchell/Netravali filter, iirc. Those who actually care about these others would probably also care enough to want their tunable parameters as well, or more advanced non-separable resize kernels.

So point, bilinear, bicubic, and lanczos would seem to be enough for anyone using batch resize. If you wanted to emulate photoshop, you could have a bicubic smoother (lower "c") like photoshop, to fill that halfway point in.

[...]

Point, box, and nearest neighbor are (usually) synonyms for the same thing, [...]
Nicky Page ([url=http://nickyguides.digital-digest.com/bilinear-vs-bicubic.htm]Bicubic Resizing vs Bilinear[/url]) wrote:Everyone uses Bicubic resizing religiously when they make DivX movies or any time they resize pictures in photo editing software. I have suggested that it is best to use Bilinear to shrink images and Bicubic to enlarge them. In fact I believe it is a rule that shouldn't be broken. But then again there is mixed opinion even among experts on this matter. Digital photo experts JASC (makers of Paint Shop Pro) comment: "Use the Bilinear Resampling method for shrinking these images and Bicubic for enlarging them". Whereas the help file of Adobe Photoshop just mentions that Bicubic is more exact method for resizing. In actual fact Bicubic is more precise, but only when it comes to enlarging. When it comes to shrinking its exactness can actually produces pixelation, because to shrink an image pixels must be discarded anyway.

The following shows examples demonstrating this effect. There are reasons you may prefer Bicubic shrinking methods though. Namely, if sharpness is absolutely vital and pixelation problems are less important.
by XnTriq
Wed Dec 30, 2015 10:15 pm
Forum: Classic - Bug Reports
Topic: Error saving PNG
Replies: 18
Views: 6747

Re: Error saving PNG

Welcome back, omniplex :-)
omniplex wrote:
XnTriq wrote:
...
Can someone please confirm?
WFM.
THX.
omniplex wrote:Presumably you know deark mentioned in another thread, there is a working Windows 64bits binary in the tarball.
I knew about Jason Summers' site and use some of his software (TweakPNG in particular). deark escaped my notice, though. Wow! Danke for the hint :D
omniplex wrote:Something else you presumably know, but I didn't see it in the plugin thread, there are some free and some shareware Simple Filter plugins by a German photographer. The free versions work for me in XnView. The XnView ICC option claims to affect JPEG and TIFF, but actually it also works for PNG:
I've actually posted a link to SimpelFilter before but I failed to realize that they also have LE editions which are free. So again: Thank you for pointing this out!
omniplex wrote:The XnView ICC option claims to affect JPEG and TIFF, but actually it also works for PNG:

[…]

source
Interesting series of articles by SimpelFilter's head honcho 8)
(It's too bad that Heise had to shut down their UK operations.)
by XnTriq
Fri Sep 11, 2015 2:30 pm
Forum: Classic - Suggestions
Topic: SHARPEN "built in" in resize image panel
Replies: 7
Views: 3940

Re: SHARPEN "built in" in resize image panel

As of version 2.34, sharpening is available in…
  • Image » Resize...
… but not yet in…
  • Tools » Batch Processing... » Transformations » Image » Resize
Results for resampling of Rings1.gif to 20% with XnView:
Lanczos without “Apply sharpen”
Lanczos without “Apply sharpen”
p127545_1.png (12.88 KiB) Viewed 3681 times
Lanczos with “Apply sharpen”
Lanczos with “Apply sharpen”
p127545_2.png (12.66 KiB) Viewed 3681 times
Bilinear without “Apply sharpen”
Bilinear without “Apply sharpen”
p127545_3.png (28.02 KiB) Viewed 3678 times
Bilinear with “Apply sharpen”
Bilinear with “Apply sharpen”
p127545_4.png (31.12 KiB) Viewed 3678 times
BTW: Activating the Apply sharpen option in the Resize dialog seems to be the equivalent of applying Sharpen (Filter » Effects... » Misc.) with a intensity parameter of 50.

Photoshop's “Bicubic Sharper” in comparison:
by XnTriq
Sun Aug 16, 2015 7:30 pm
Forum: Classic - Suggestions
Topic: SHARPEN "built in" in resize image panel
Replies: 7
Views: 3940

Re: SHARPEN "built in" in resize image panel

I support this request.

BTW: Enhance Focus and Focus Restoration (Filter » Effects… » Enhance) are also worth considering.
by XnTriq
Tue Apr 28, 2015 11:45 pm
Forum: Classic - General Support
Topic: resizing algorithms
Replies: 9
Views: 19646

Re: resizing algorithms

XnTriq ([url=http://newsgroup.xnview.com/viewtopic.php?p=109743#p109743]bicubic resize ?[/url]) wrote:
Algorithms currently available in XnView v1.9 (Image » Resize):
  1. Nearest Neighbour
  2. Bilinear
  3. Hermite (Cubic Hermite spline?)
  4. Gaussian
  5. Bell
  6. Bspline
  7. Mitchell
  8. Lanczos (3-lobe)
  9. Hanning
foxyshadis ([url=http://newsgroup.xnview.com/viewtopic.php?t=3496]Info about Resampling algorithms[/url]) wrote:Mitchell is bicubic.

Agreed that some of the resizers aren't very useful. Could be worse, could be the full list of imagemagick resizers. :p Gauss, bell, and bspline are almost indistiguishable, and often only useful as specialized effects, not generic outputs; in general they're too close to bilinear to even matter. There are a wide range of bsplines but this one doesn't retain much sharpness. Hermite is practically indistiguishable from Mitchell - in fact it's one of the degenerate cases of the Mitchell/Netravali filter, iirc. Those who actually care about these others would probably also care enough to want their tunable parameters as well, or more advanced non-separable resize kernels.

So point, bilinear, bicubic, and lanczos would seem to be enough for anyone using batch resize. If you wanted to emulate photoshop, you could have a bicubic smoother (lower "c") like photoshop, to fill that halfway point in.

[...]

Point, box, and nearest neighbor are (usually) synonyms for the same thing, [...]
Nicky Page ([url=http://nickyguides.digital-digest.com/bilinear-vs-bicubic.htm]Bicubic Resizing vs Bilinear[/url]) wrote:Everyone uses Bicubic resizing religiously when they make DivX movies or any time they resize pictures in photo editing software. I have suggested that it is best to use Bilinear to shrink images and Bicubic to enlarge them. In fact I believe it is a rule that shouldn't be broken. But then again there is mixed opinion even among experts on this matter. Digital photo experts JASC (makers of Paint Shop Pro) comment: "Use the Bilinear Resampling method for shrinking these images and Bicubic for enlarging them". Whereas the help file of Adobe Photoshop just mentions that Bicubic is more exact method for resizing. In actual fact Bicubic is more precise, but only when it comes to enlarging. When it comes to shrinking its exactness can actually produces pixelation, because to shrink an image pixels must be discarded anyway.

The following shows examples demonstrating this effect. There are reasons you may prefer Bicubic shrinking methods though. Namely, if sharpness is absolutely vital and pixelation problems are less important.
by XnTriq
Sat Dec 06, 2014 11:30 am
Forum: Classic - Bug Reports
Topic: certain PNGs cannot be saved
Replies: 9
Views: 3915

Re: certain PNGs cannot be saved

omniplex wrote:
XnTriq wrote:TweakPNG
Brilliant tool, I planned to add this to the "other software" forum as a thank you for lots of interesting links (today I read something about JPEG ELA forensics), but obviously you know TweakPNG already. I could post two scripts for the TweakPNG "tools" feature, combining PNGwolf+TruePNG (if anybody uses that, maybe Dos386.)
I'm glad to hear that you find the links useful, omniplex! (I assume you're referring to JohnFredC's topic about image quality.)
TweakPNG has proven indispensable when it comes to solving PNG mysteries. There's lots of other cool stuff to explore on Jason Summers's site!
omniplex wrote:
XnTriq wrote:XnView will resave sample.png without error, if Use ICC Embedded Profile (JPEG/TIFF) - Very slow (Tools » Options... » General » ICC) is activated.
Good to know, as it happens I have that, together with an "sRGB intent saturation" default. Kudos.
BTW: PngOptimizer discards the iCCP, pHYs as well as the tEXt chunks and combines all IDATs.
by XnTriq
Sat Feb 01, 2014 10:30 pm
Forum: Classic - Bug Reports
Topic: Halo effect when resizing images with alpha transparency
Replies: 1
Views: 430

Re: Reducing Halo Effect in Rescaled/Resized Images

XnTriq wrote:The challenge is to produce the same result when resizing the original and the optimized logo.
Pixlr Editor passes the test with flying colors.

Resizing (25%) mouth1.png with XnView v2.13 (Lanczos) vs. Pixlr Editor:
p117075.gif
p117075.gif (9.13 KiB) Viewed 440 times
There's a tutorial by Jason Summers explaining how to fix this issue:
by XnTriq
Sat Jan 11, 2014 8:30 am
Forum: XnConvert
Topic: Reducing Halo Effect in Rescaled/Resized Images
Replies: 14
Views: 4541

Re: Reducing Halo Effect in Rescaled/Resized Images

This problem is not unique to XnView/XnConvert. I'll try to find a workaround.

BTW: Do you use the lastest version (1.60) of XnConvert?
by XnTriq
Sat Apr 27, 2013 6:30 pm
Forum: Classic - General Support
Topic: Best way to increase 16x16 to 32x32
Replies: 3
Views: 481

Re: Best way to increase 16x16 to 32x32

Hi Peter (o:

When choosing the best algorithm for enlarging your icons, the type of content (photos vs. clipart) has to be taken into account.
by XnTriq
Sun Feb 10, 2013 11:00 pm
Forum: Classic - Suggestions
Topic: bicubic resize ?
Replies: 4
Views: 3447

Re: bicubic resize ?

Algorithms currently available in XnView v1.9 (Image » Resize):
  1. Nearest Neighbour
  2. Bilinear
  3. Hermite (Cubic Hermite spline?)
  4. Gaussian
  5. Bell
  6. Bspline
  7. Mitchell
  8. Lanczos (3-lobe)
  9. Hanning
foxyshadis ([url=http://newsgroup.xnview.com/viewtopic.php?t=3496]Info about Resampling algorithms[/url]) wrote:Mitchell is bicubic.

Agreed that some of the resizers aren't very useful. Could be worse, could be the full list of imagemagick resizers. :p Gauss, bell, and bspline are almost indistiguishable, and often only useful as specialized effects, not generic outputs; in general they're too close to bilinear to even matter. There are a wide range of bsplines but this one doesn't retain much sharpness. Hermite is practically indistiguishable from Mitchell - in fact it's one of the degenerate cases of the Mitchell/Netravali filter, iirc. Those who actually care about these others would probably also care enough to want their tunable parameters as well, or more advanced non-separable resize kernels.

So point, bilinear, bicubic, and lanczos would seem to be enough for anyone using batch resize. If you wanted to emulate photoshop, you could have a bicubic smoother (lower "c") like photoshop, to fill that halfway point in.

[...]

Point, box, and nearest neighbor are (usually) synonyms for the same thing, [...]
Nicky Page ([url=http://nickyguides.digital-digest.com/bilinear-vs-bicubic.htm]Bicubic Resizing vs Bilinear[/url]) wrote:Everyone uses Bicubic resizing religiously when they make DivX movies or any time they resize pictures in photo editing software. I have suggested that it is best to use Bilinear to shrink images and Bicubic to enlarge them. In fact I believe it is a rule that shouldn't be broken. But then again there is mixed opinion even among experts on this matter. Digital photo experts JASC (makers of Paint Shop Pro) comment: "Use the Bilinear Resampling method for shrinking these images and Bicubic for enlarging them". Whereas the help file of Adobe Photoshop just mentions that Bicubic is more exact method for resizing. In actual fact Bicubic is more precise, but only when it comes to enlarging. When it comes to shrinking its exactness can actually produces pixelation, because to shrink an image pixels must be discarded anyway.

The following shows examples demonstrating this effect. There are reasons you may prefer Bicubic shrinking methods though. Namely, if sharpness is absolutely vital and pixelation problems are less important.
by XnTriq
Thu Aug 26, 2010 2:00 am
Forum: Classic - General Support
Topic: iPhone Flavor of PNG format
Replies: 26
Views: 8456

Re: iPhone Flavor of PNG format

MaxSt wrote:Yeah, lets implement normal PNG completely (some features are still missing), before supporting this abomination.
I fully support your request for full support ;-)

According to what I've been reading on the interwebs, ...
Borko Furht ([url=http://books.google.com/books?id=Ipk5x-c_xNIC&lpg=PR1&ots=ovOkuhRiXL&dq=%22Encyclopedia%20of%20Multimedia%22&pg=PR1#v=onepage&q&f=false]Encyclopedia of Multimedia[/url] » Page 729) wrote:Chunk types can come from three main sources: the PNG standard, registered public chunk types maintained by the PNG Development Group, and private chunks, defined by some applications. This chunk-based structure is designed to allow the PNG format to be extended while maintaining compatibility with older versions.
... ancillary custom chunks (as used for Math PNG, Worms, ZDoom etc.) come in two flavors:
  1. Public chunks (= registered = standardized)
  2. Private chunks (= unregistered = non-standardized)
Jonathan Branam (Dr.Dobb's: [url=http://www.drdobbs.com/mobility/224400563?pgno=2]Developing for the iPad[/url] » Save Fast and Save Often) wrote:The concept of continuous, incremental saving is crucial to the operation of every iPhone OS application. Users on the phone may be interrupted at any time to receive a call and may decide to exit your application at any time. Apple frowns on applications that offer an explicit Save or Load button, instead encouraging developers to save while the user works. For Ideate, I designed a custom file format based on the PNG image file format. The PNG format supports custom chunks in the file which can contain any data that an application required. Adobe Fireworks uses this approach to store all of its metadata in a PNG file and I thought it was a good idea. This means that browsers, image editors, and mail clients can all render an Ideate image, but only the Ideate app itself will load and save the custom chunks of data inside the file.
XnTriq ([url=http://newsgroup.xnview.com/viewtopic.php?p=65771#p65771]Common graphic formats[/url]) wrote:
libpng.org ([url=http://www.libpng.org/pub/png/pngintro.html]A Basic Introduction to PNG Features[/url]) wrote:Like GIF and TIFF, PNG is a raster format, which is to say, it represents an image as a two-dimensional array of colored dots (pixels). PNG is explicitly not a vector format, i.e., one that can store shapes (lines, boxes, ellipses, etc.) and be scaled arbitrarily without any loss of quality (generally speaking). For that you probably want SVG or PostScript. (There are some private extensions to PNG that add vector information in addition to PNG's regular pixels — Macromedia's Fireworks does something along those lines — but no valid PNG may omit the pixel data.)
Private chunks” in Fireworks PNG files: prVW, mkBF, mkBS, mkBT, mkTS.
Wikipedia (Portable Network Graphics » [url=http://en.wikipedia.org/wiki/Portable_Network_Graphics#Software_support]Software support[/url]) wrote:Adobe Fireworks (formerly by Macromedia) uses PNG as its native file format, allowing other image editors and preview utilities to view the flattened image. However, Fireworks by default also stores meta data for layers, animation, vector data, text and effects. Such files should not be distributed directly. Fireworks can instead export the image as an optimized PNG without the extra meta data for use on web pages, etc.
by XnTriq
Thu Dec 11, 2008 5:30 pm
Forum: Classic - Bug Reports
Topic: Incorrect display of a png image
Replies: 6
Views: 4743

Re: Incorrect display of a png image

xnview wrote:Please enable 'Use alpha channel'
This setting has no effect, because we're dealing with a grayscale PNG. :|

My own “collection” so far:Webshots.com and others use translucent PNGs to allow their users to switch the site's color scheme on the fly (i.e. w/o loading additional page elements): Links of interest:
by XnTriq
Sun Aug 31, 2008 12:00 am
Forum: XnView - FAQ
Topic: Common graphic formats
Replies: 9
Views: 27521

Tagged Image File Format (TIFF)

QuarkXPress, InDesign, Photoshop and Photo-Paint have read & write support for vector clipping paths in TIFF files. Portable Network Graphics (PNG)
libpng.org ([url=http://www.libpng.org/pub/png/pngintro.html]A Basic Introduction to PNG Features[/url]) wrote:Like GIF and TIFF, PNG is a raster format, which is to say, it represents an image as a two-dimensional array of colored dots (pixels). PNG is explicitly not a vector format, i.e., one that can store shapes (lines, boxes, ellipses, etc.) and be scaled arbitrarily without any loss of quality (generally speaking). For that you probably want SVG or PostScript. (There are some private extensions to PNG that add vector information in addition to PNG's regular pixels — Macromedia's Fireworks does something along those lines — but no valid PNG may omit the pixel data.)
Private chunks” in Fireworks PNG files: prVW, mkBF, mkBS, mkBT, mkTS.
Wikipedia ([url=http://en.wikipedia.org/wiki/Portable_Network_Graphics]Portable Network Graphics[/url]) wrote:Adobe Fireworks (formerly by Macromedia) uses PNG as its native file format, allowing other image editors and preview utilities to view the flattened image. However, Fireworks by default also stores meta data for layers, animation, vector data, text and effects. Such files should not be distributed directly. Fireworks can instead export the image as an optimized PNG without the extra meta data for use on web pages, etc.