DrawImage draws faded image

[Frecklefoot]

I'm using DrawImage() to copy one image onto another, larger one. I'm using
a DrawImage() overload to stretch the source image onto the destination.
The problem is that when it draws the stretched version, it fades off on the
right--it becomes transparent. While an interesting effect, it is not what
I want; I want a verbatim copy of the source image, just bigger.

One source of the problem may be that the source image is 2 pixels wide and
I am stretching it to 20 pixles. But I have tried pre-stretching it (making
a new Image with the larger dimensions), but that doesn't work either. I
don't have any transparent colors specified.

Any ideas? TIA!

[John Wood]

If it's just a 2x2 bitmap to begin with, couldn't you just draw the expanded
version?
I mean it has to be either a diagonal line, L shape, filled or blank!

"Frecklefoo t" <Chris_nospam@n ospam_nsageotec h.com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. ..

I'm using DrawImage() to copy one image onto another, larger one. I'm using a DrawImage() overload to stretch the source image onto the destination.
The problem is that when it draws the stretched version, it fades off on the right--it becomes transparent. While an interesting effect, it is not what I want; I want a verbatim copy of the source image, just bigger.

One source of the problem may be that the source image is 2 pixels wide and I am stretching it to 20 pixles. But I have tried pre-stretching it (making a new Image with the larger dimensions), but that doesn't work either. I
don't have any transparent colors specified.

Any ideas? TIA!

[John Wood]

Another thing to look at (if you really do want to expand the icon) is the
InterpolationMo de property of the Graphics instance. This dictates what
strategy will be used to expand the bitmap (resampling etc.).

"Frecklefoo t" <Chris_nospam@n ospam_nsageotec h.com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. ..

I'm using DrawImage() to copy one image onto another, larger one. I'm using a DrawImage() overload to stretch the source image onto the destination.
The problem is that when it draws the stretched version, it fades off on the right--it becomes transparent. While an interesting effect, it is not what I want; I want a verbatim copy of the source image, just bigger.

One source of the problem may be that the source image is 2 pixels wide and I am stretching it to 20 pixles. But I have tried pre-stretching it (making a new Image with the larger dimensions), but that doesn't work either. I
don't have any transparent colors specified.

Any ideas? TIA!

[Marcin Grzêbski]

Hi Frecklefoot,

I'm using DrawImage() to copy one image onto another, larger one. I'm using
a DrawImage() overload to stretch the source image onto the destination.
The problem is that when it draws the stretched version, it fades off on the
right--it becomes transparent. While an interesting effect, it is not what
I want; I want a verbatim copy of the source image, just bigger.

One source of the problem may be that the source image is 2 pixels wide and
I am stretching it to 20 pixles. But I have tried pre-stretching it (making
a new Image with the larger dimensions), but that doesn't work either. I
don't have any transparent colors specified.

Any ideas? TIA!

Try setting: Graphics.Interp olationMode to "NearestNeighbo r"
and set PixelOffsetMode to "None" (or "HighSpeed" ).

I know from my practise, that DrawImage is working with strange
offset. So, i had some trouble to guess right settings of:
public void DrawImage(
Image image,
int x,
int y,
int width,
int height
)
method. So i have to use version:
public void DrawImage(
Image image,
Rectangle destRect,
Rectangle srcRect,
GraphicsUnit srcUnit
);

HTH

Marcin

[Marcin Grzêbski]

Hi,

Try setting: Graphics.Interp olationMode to "NearestNeighbo r"
and set PixelOffsetMode to "None" (or "HighSpeed" ).
and CompositingMode to "SourceCopy "
I know from my practise, that DrawImage is working with strange
offset. So, i had some trouble to guess right settings of:
public void DrawImage(
Image image,
int x,
int y,
int width,
int height
)
method. So i have to use version:
public void DrawImage(
Image image,
Rectangle destRect,
Rectangle srcRect,
GraphicsUnit srcUnit
);

HTH

Marcin

[Frecklefoot]

Thanks, that helped. What I needed to do was set the CompositingMode to
SourceCopy. Your tip put me on the right track. BTW, the source image is 2
pixels _wide_, but several hundred high.

TA

"John Wood" <[e-mail]> wrote in message
news:eU******** ******@TK2MSFTN GP12.phx.gbl...

Another thing to look at (if you really do want to expand the icon) is the
InterpolationMo de property of the Graphics instance. This dictates what
strategy will be used to expand the bitmap (resampling etc.).

"Frecklefoo t" <Chris_nospam@n ospam_nsageotec h.com> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. ..

I'm using DrawImage() to copy one image onto another, larger one. I'm

using

a DrawImage() overload to stretch the source image onto the destination.
The problem is that when it draws the stretched version, it fades off on

the

right--it becomes transparent. While an interesting effect, it is not

what

I want; I want a verbatim copy of the source image, just bigger.

One source of the problem may be that the source image is 2 pixels wide

and

I am stretching it to 20 pixles. But I have tried pre-stretching it

(making

a new Image with the larger dimensions), but that doesn't work either. I don't have any transparent colors specified.

Any ideas? TIA!