On Fri, 10 Feb 2012, Benoît Minisini wrote: > Le 06/02/2012 21:19, tobias a écrit : > > hi, > > > > Benoît Minisini wrote: > >> Le 04/02/2012 01:19, tobias a écrit : > >>> On 04.02.2012 01:12, tobias wrote: > >>>> Hi, > >>>> > >>>> I really need help. There's a lot of work with colors in Images and > >>>> Pictures in a project and between these classes. This is generally > >>>> speaking as follows: I have a class which has an 8*8px Image which is > >>>> manipulated (due to the easy of accessing pixels directly). Using a > >>>> property of my class, I provide access to a scaled version of the Image > >>>> as a Picture (which is created when requested). So I do some things and > >>>> when manually resizing the Image to get the prototype of the Picture to > >>>> return (it is needed as bigger version of the Image without > >>>> anti-aliasing, I don't get this result with Image.Stretch(), and doing > >>>> it manually is not a problem) there seem to appear problems with > >>>> transparency. I read that Pictures do not have an alpha channel and I > >>>> noticed that colors from the ColorChooser or Color class are given with > >>>> alpha channel set to 0x00 which will be transparent for the Image > >>>> class... so I tried adding&Hff000000& to whatever color is assigned to > >>>> any pixel in the 8*8px Image or not to do it and some other experiments > >>>> but nothing worked on the entire project. there's always something > >>>> transparent or black or whatever. I really go nuts with this. Anyone to > >>>> my rescue? > >>>> > >>>> Regards, > >>>> Tobi > >>> wait a minute. I forgot to say that I don't even need the transparency > >>> feature of the Image class. I only use Image - as I said - because of > >>> Image[x, y] pixel access. For the meantime - or as a final solution? > >>> there may be a lot of those accesses and I thought using Image[x, y] > >>> will be the most efficient way to go - I switch to using an 8*8px > >>> Picture and Draw.Pixel() instead but I would really appreciate anyone > >>> clarify this topic to me. > >>> > >> > >> I understand nothing. Maybe because I'm a little sick, but if you can be > >> clearer... > >> > > > > it's a messy explanation, i just recalled too... > > > > the situation is as follows: i have a class that takes care of designing > > a picture for me according to user input. because of the ease of > > accessing pixels with the image class i took an image behind the scenes > > but it has to be converted to a picture for display in a PictureBox at > > the front end. moreover it has to be resized which i do manually and is > > no big deal for my format. i used to import pictures and images into the > > class, etc. which overall introduces as big back and forth of image<-> > > picture conversion, resizing, etc. > > the problem first came up when i incorporated palettes created by > > another program and stored in binary files. i noticed that these were in > > ARGB format with the A component set to 0x00 all the time (colors came > > from a ColorChooser, later i noticed that the constants in the Color > > class do likewise). while this works (color is displayed) when drawing > > it to a picture, it doesn't when writing it to an image pixel. i tried > > conversion functions and everything that came in my mind. > > at the end i rewrote the class to use pictures. those pictures are > > created with the Transparent = False instanciation parameter. from those > > i can derive Picture.Image on which i operate to speed things up. > > this is sort of solved and the program works fine now. > > > > i seem to repress the memory of what i tried (pathetic programmer's > > brain :) ) but i can tell that nothing worked on the entire project > > (which was certainly a fault due to my quick fixes or project > > infrastructure) but to clarify things: > > it resulted in transparency in all kinds of places in the whole program > > originally introduced by reading colors from standard components that > > had their alpha channel zeroed which according to the docs signaled the > > image class that this color is fully transparent. > > > > i hope it didn't get as complicated but recalling the situation pointed > > me to the fact that actually i do not know why it is working now (seems > > to rely on the Transparent = False picture instanciation?)... > > > > regards, > > tobi > > > > Mff... If you need to create a Picture, start from an Image, and convert > it to a Picture at the last step. Do not use the Transparent property of > Pictures. > > As for transparency: it is inverted between pixels in memory and Gambas > color values. If you use the Image class and the [] operator, then this > is taken into account transparently. > > This is all I can say: I hope it will help you! > > -- > Benoît Minisini > > ------------------------------------------------------------------------------ > Virtualization & Cloud Management Using Capacity Planning > Cloud computing makes use of virtualization - but cloud computing > also focuses on allowing computing to be delivered as a service. > http://www.accelacomm.com/jaw/sfnl/114/51521223/ > _______________________________________________ > Gambas-user mailing list > Gambas-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gambas-user
i got a working solution now but your statement cleared up the reason for which my conversion function (simply adding 0xff000000 to all colors smaller than that value before passing them to Image[]) didn't succeed... thanks anyway. ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
