About the image resizing...

[Lord Kharsis]

I have a 4.8 megapixels, and of course I have to resize my pictures because they are too big. Before, I opened the pictures in windows preview, witch auto-resize the pictures, and took a print screen, witch I pasted in paint, and I just had to crop. But I've realized that the print screen changed the colors a bit. So now I'm using paint or gimp, I select all the picture and I resize it, to 35% for example. But it's altering the quality a little, it seems the curves aren't that round anymore and I have a "staircase" (aliasing) problem. What is the best way the resize the pictures? Thanks!

 

[kathrynloch]

If I recall my GIMP correctly, you need to Scale the picture. There's two different subjects. Resizing is for print and Scaling is "resizing" the actual pixels on the screen...but I might be a bit muddled on that (sorry, I'm tired). Also, if you save as a JPG, its a balancing act to not have a huge file but keep the quality high enough you don't see degradation. You may have to save a couple of different times and compare the file sizes. GIMP may also have a tool that allows you to tweak the quality and see the kb changes. JPG's are saved as "lossy" files. Basically to condense them for the web, the JPG process strips the extras from the picture that don't have an immediate impact on the image. But you start getting poorer and poorer quality the smaller kb you go.

But you want to crop your image first! Get rid of the void space and you don't have to mess with it taking up memory when scaling. After that you can worry about scaling and JPG lossy files. But it should be easier to get closer to the size you need.

I know I have to save, check kb size, tweak here, tweak there, etc. several times before I get the file to fit within the parameters but still be the best it can possibly be. It will just take time to get used to it. Oh and GIMP has a surprisingly good help/FAQ documentation. Don't hesitate to use it as it has a lot of good information.

Good luck!

OH PS - make sure you have the box checked to maintain the Ratio or Proportions of the picture. If you change one side, without the check box, it will skew your image, which sounds like it might be part of your troubles.

 

[Lord Kharsis]

thanks a lot, that was very helpfull!

 

[Donna111]

HI there
That exactly what i want to do.I tried to resize the image using this code:
namespace RE__Test
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
string fileName = "c:/Sample.png";

REImage reImage = REFile.OpenImageFile(fileName);

Image Processing.ApplyResize(reImage, 500, 500);

REFile.SaveImageFile(reImage, "c:/reimage.png", new PNGEncoder());
But it can not work after i entering the code.What's wrong with my code?Thanks a lot.