Various discussion boards for XnView and related products
https://newsgroup.xnview.com/
I can confirm. I've downloaded your PNG image and it can be clearly seen that XnView does not display all colours. The image has 578 different colours, whereas XnView counts only 167.Zefram wrote:Every PNG-image I export from Inkscape (a vector drawing program) is incorrectly displayed in xnview (1.82.2). Grey values appear as black. The curious thing is that the thumbnails are correct!
Example Image:
http://commons.wikimedia.org/wiki/Image ... roblem.png
I guess Pierre can say more...I can't confirm, i have 580 unique colors, and all is ok...helmut wrote:I can confirm. I've downloaded your PNG image and it can be clearly seen that XnView does not display all colours. The image has 578 different colours, whereas XnView counts only 167.Zefram wrote:Every PNG-image I export from Inkscape (a vector drawing program) is incorrectly displayed in xnview (1.82.2). Grey values appear as black. The curious thing is that the thumbnails are correct!
Example Image:
http://commons.wikimedia.org/wiki/Image ... roblem.png
Hello !
Kind regards,PNG — The Definitive Guide: [url=http://www.libpng.org/pub/png/book/chapter01.html]Chapter 1. An Introduction to PNG[/url] (??/Jun/1999) wrote:A channel, on the other hand, refers to the collection of all samples of a given type in an image — for example, the green components of every RGB pixel. Thus a truecolor image has three channels, while a grayscale image has only one. (Ordinarily one does not speak of a palette-based image as having channels.) And when discussing transparency, yet another channel type is often used: the alpha channel. This is a special kind of channel in that it does not provide actual color information but rather a level of transparency for each pixel — or, more precisely, a level of opacity, since it is most common for the maximum sample value to indicate that the pixel is completely opaque and for zero to indicate complete transparency. A truecolor image with an alpha channel is often called an RGBA image; grayscale images with alpha channels are rarer and don't have a special abbreviation (although I may refer to them as “gray+alpha”).
[url=http://www.libpng.org/pub/png/spec/1.2/PNG-Glossary.html]Portable Network Graphics (PNG) Specification, Version 1.2[/url] (??/Aug/1999) wrote:Alpha | A value representing a pixel's degree of transparency. The more transparent a pixel, the less it hides the background against which the image is presented. In PNG, alpha is really the degree of opacity: zero alpha represents a completely transparent pixel, maximum alpha represents a completely opaque pixel. But most people refer to alpha as providing transparency information, not opacity information, and we continue that custom here.
[url=http://www.libpng.org/pub/png/spec/iso/index-object.html]Portable Network Graphics (PNG) Specification, Second Edition[/url] (10/Nov/2003) wrote:alpha | a value representing a pixel's degree of opacity. The more opaque a pixel, the more it hides the background against which the image is presented. Zero alpha represents a completely transparent pixel, maximum alpha represents a completely opaque pixel.
A Guide to Inkscape: Glossary wrote:alpha | The transparency of an object (or pixel). If an object with a non-maximal value of alpha is placed over another object, the second object will be visible under the first. In Inkscape a value of Alpha of 255 means the object is completely opaque while a value of 0 means it is fully transparent (not visible).
Right it's a 32bits png file....XnTriq wrote:If Compose image with alpha 32bits (Options » Read » PNG) is activated XnView displays the image correctly. But why isn't 32 bits in the Image menu grayed out?
xnview wrote:Right it's a 32bits png file....XnTriq wrote:If Compose image with alpha 32bits (Options » Read » PNG) is activated XnView displays the image correctly. But why isn't 32 bits in the Image menu grayed out?
Hi Pierre! Hello ! Kind regards, cordialement, Hi Clo!
Could this be a solution to the problem described by Zefram:Inkscape Wiki FAQ wrote:Q: The PNGs exported by Inkscape have jagged edges/no antialiasing/funny background.
[...]
If you want to open the exported PNG bitmaps in MS-Word, you will also have to change the alpha-opacity (in document-properties dialog) to full, and then export — the result will be much better.
Related discussions:But do you have "compose image with alpha"???XnTriq wrote:xnview wrote:Right it's a 32bits png file....XnTriq wrote:If Compose image with alpha 32bits (Options » Read » PNG) is activated XnView displays the image correctly. But why isn't 32 bits in the Image menu grayed out?
When I open a 32-bit image in View mode and pull down the Image menu, the True Colour (= 24-bit truecolor) option is grayed out, while the 32 bits (= 32-bit truecolor) option is not.
Please correct me if I'm wrong, but shouldn't it be the other way around, because the color depth of the image can only be decreased?
Code: Select all
Chunk | Contents
------+-----------------------------------------------------------------------
IHDR | PNG image header: 80x87, 8 bits/sample, truecolor+alpha, noninterlaced
sBIT | significant bits/sample: R:8,G:8,B:8,A:8
tEXt | standard text: [Software]=[www.inkscape.org]
IDAT | PNG image data
IDAT | PNG image data
IEND | end-of-image marker
TweakPNG 1.2.1
Code: Select all
Chunk | Contents
------+----------------------------------------------------------------------
IHDR | PNG image header: 162x150, 8 bits/sample, truecolor+alpha, interlaced
gAMA | file gamma = 1.00000
IDAT | PNG image data
IDAT | PNG image data
IDAT | PNG image data
IDAT | PNG image data
IEND | end-of-image marker
TweakPNG 1.2.1