but don' know the rgb tuple for dark gray the putpixel(method doesn' accept standard color name like 'darkgray'so you have to use imagecolor getcolor(to get color tuple from 'darkgrayloop through the pixels in the bottom half of the image and pass putpixel(the return value of imagecolor getcolor(zand you should now have an image that is light gray in its top half and dark gray in the bottom halfas shown in figure - you can call getpixel(on some coordinates to confirm that the color at any given pixel is what you expect finallysave the image to putpixel png figure - the putpixel png image of coursedrawing one pixel at time onto an image isn' very convenient if you need to draw shapesuse the imagedraw functions explained later in this projectadding logo say you have the boring job of resizing thousands of images and adding small logo watermark to the corner of each doing this with basic graphics program such as paintbrush or paint would take forever fancier graphics application such as photoshop can do batch processingbut that software costs hundreds of dollars let' write script to do it instead say that figure - is the logo you want to add to the bottom-right corner of each imagea black cat icon with white borderwith the rest of the image transparent figure - the logo to be added to the image