Painting - Gradient Effect From Red To Yellow

in the painteventargs of the form, i've got something like this: [Code] i'm getting a very cool gradient effect from red to yellow, but why is that the case? shouldn't the 1x1 portion be totally red? and the remaining pixels be totally yellow?

i'm not trying to paint a 1x1 portion in my form, im trying to know why e.Graphics.DrawImage(bm, 0, 0, 100, 100) doesn't draw a 1x1 red portion on my form through the code provided above. my understanding is that 0,0 specifies the point to draw the image. bm specifies the image actually drawn, which is 1x1 px. and 100,100 specifies the allowed space for the graphics to draw, if this is correct, the first pixel should be red and the remaining 9999 pixels should be yellow but they aren't.