How to change Image Resolution?

Hi There,

How can we change image resolution, (dpi) in the picture box control.

thanks in advance

bye,
SIDHU

The DPI thing got me confused, do you want to change to size of a picture?

Look up the .Paintpicture method

dpi is dots per inch

But as Flyguy said, do you want to change the size or just the resolution????

If you want to change the picture to a better quality or worse quality, then you mean to talk about the BITS as in Bit Depth of the picture. Most BMP's are 24 Bits, some 32 Bits, and the lesser, 16 Bits, but you can always decrease this amount. I think the least I've ever seen a bitmap go was 4 bits, but I'm sure you can even take it to 2 bits. Technically the higher the bits, the better the quality. GIFs are something like 4 bits, and 2 bits.

Is this what you are referring to?

I think u are incorrect Sologhost, to my understanding, GIF's are 8-16 bits and BMP's as u said are 24 bits (Normally) I suggest gundavarapu use jpegs. Which take small space but have pretty good resolution.

Not that it really matters, but GIFs are 8 bits or less. The lowest they (and BMPs) can go is 1-bit (monochrome).

I don't think BMPs can do 32-bit (after all, the extra 8-bits that 32 has over 24-bit images are used for an alpha channel, and bitmaps don't use alpha). I am also pretty sure that there are no 16-bit image formats. In 16-bit screen modes, the color palette is dynamic. Imagine an image file that had to store a palette of 65,536 colors in it. =)

That was a bit off topic, though. Sorry. =)

Yes...BMP can't be 32bit....and I think that Gif and Jpeg kan both be used...for diffrent purposes of cours...

Originally Posted by: NoteMe

Yes...BMP can't be 32bit....


Tell that to Adobe Photoshop 7.0

Back to the original question; Do you want to resize your picture or change the color depth?

To resize (I assume this because you mentioned DPI) an image, you use PaintPicture wth many more parameters than is normally healthy. You bascally give a different size in the destination height/width than the source. If your DPI request had to do with printing, you set the DPI that will be printed in the Printer object. You then just have to PaintPicture to the Printer object and call that start/execute/done method (that drop-down on class members is a godsend!)

I did mean resolution, anyway tnx to all for all the great stuff regarding the bits.

any sample code in this regard would be really handy,

once again tnx a lot

Look up the PaintPicture method in the help.