AutoHotkey Community

Hi, below I am trying to use the myColMat to adjust a bitmap. However, the results are poor, and not approximate. Gradient shades turn murky colours. Does anyone know how to remedy/fix this?

It looks nice, indeed.
Maybe the font sizes below 24 point with background image and color made my tests look ugly.
thank you. I find your subtitle script very interesting.

The improved code is here. This is arial 24 with 1pt border.

Hi Tic. Would you give an example on how to use Gdip_BitmapFromBRA() ?
Also, is the inverse possible ? : Gdip_BRAFromBitmap()

What I am interested in doing is mixing calls to DrawImage with numput.
if i create a dibsection and get a pointer to the pixeldata (ppvbits), can i use drawimage and numput, to get and set the pixeldata from ppvbits directly?

I am able to change the data in ppvbits using c in my medical image viewing program: ahkpacs. I am interested in using gdi+ drawimage functions on the same dibsections / ppvbit data also.

I am willing to use 24bit images (currently using 8bit images, but you have told me previously that drawimage doesn't work with 8 bit images).

Thanks.

[Edit]
I think I figured it out. Looks like sean's screencapture.ahk actually captures images to a dibsection before writing to a file... essentially a Gdip_BRAFromBitmap()...
Also, it seems I can just pass the bitmap created with createdibsection to Gdip_GraphicsFromImage(pBitmap)...

Now, I wonder if I can mix gdip with opengl as opengl seems to have much better support for 16bit grayscale images, and will probably enable other performance gains with double buffering and 3d textures...

do you have a double buffering example with gdip?

Hello, thank you if anyone can tell me what I didn't do to make this work. Several Windows based paint programs allow this sort of function. I don't see precisely all the way the function works to the degree I am asking below. Thank you all for any kind & helpful assistance!

hi i am looking for solution to GDIP problem having above, with the sequence to make a graident image work out right. can i show example or ne1 know what is wrong? :{

Hi, I just had a quick question I'm hoping one of the GDI+ gurus can answer. I cant figure out how to rotate an image and save it to file. The example #10 works fine for me, but when I try to write the file to the disk, it just creates an unrotated copy of the file. I assume I'm somehow not applying the graphics to the bitmap, but I cant figure out how. Anyone have an idea?

Thanks

You're calling Gdip_SaveBitmapToFile(pBitmap,Output) with the wrong pointer. Post your code so we can help further.

This is the relevant part of the code, its taken from tutorial #10, and I added the savebitmaptofile commands (all 4 since I thought maybe I was putting the first one in the wrong place)




thx for helping

Oh, I've tried using G instead of pBitmap, and no file gets created

tinku99:

I will attempt to show how to use bra functions over the next week. I will bring out a new example

Halp-Life:

The colour matrix example that mrr19121970 gave seems to work perfectly

aparden:

The problem you have is that you are trying to save the original pBitmap to disk again. That pBitmap is being drawn onto the Graphics of a gdi bitmap, which is not what you want. you have 3 solutions depending on what you are going to be using this for. I will list the 2 best solutions. If you still want a gui then I would do the same as the example, but then also make a new pBitmap and get the graphics context of that and then do everything the same as that example...so do:



where Width and Height are the dimensions of the image from disk. Then use this G instead of (or as well as) the other G from then on. The alternative is to get a gdi+ bitmap from the resulting gdi bitmap at the end, however, you will have no alpha channel in this bitmap

tic, you're the man, thx!

I figured it was something about not applying the transformed graphics to the bitmap, thx for pointing out the specifics

Could I get you to briefly scan this code, just to verify that its not going to be leaving anything open in memory or anything that is unneeded? I havnt added error checking or anything, I just wanna know if I'm cleaning up correctly

Yep, you disposed of everything correctly. The only thing to note is that you didnt use RWidth and RHeight from Gdip_GetRotatedDimensions to create your new bitmap at the correct dimensions once its been rotated. Your code, but rejiggled to the correct order is below:



If you ever find yourself unsure of whether youve disposed of everything then you can loop your code and use the process tab in task manager to see if the memory usage increases over time.
I advise you dont use setbatchlines -1 when testing, and always have a hotkey to close your program

hope this helps....

sweet thx

And I figured out the RWidth and RHeight thing right after I posted. Whats the reason for the code reorganization? So that the calculations are done prior to the bitmap being loaded in memory?