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Step 3Straighten your photo
Bring your photo into your favorite image editor (GIMP, Photoshop, etc). Most have some capability to straighten photos, but more than that you want to distort the edges until your sign is as straight as possible.
I am assuming some working knowledge of image editing. I wont go into as great detail here because this is the kind of thing you can find in books or elsewhere online, so here's an overview.
First drag some guide lines over your image. My guides are in the image below - cyan lines that form a rectangle around the billboard.
In photoshop you'll want to select all, then choose "free transform" from the edit menu. Hold down command and mouse over the corner. You should be able to grab each corner and drag it until the edges of your sign run parallel to your guides. If you're lucky, you can get it perfect, but it's just important that you get close.
Images below show before, during, and after.
Remember to adjust your levels and make sure the photo is as close to accurate exposure-wise a possible.
I am assuming some working knowledge of image editing. I wont go into as great detail here because this is the kind of thing you can find in books or elsewhere online, so here's an overview.
First drag some guide lines over your image. My guides are in the image below - cyan lines that form a rectangle around the billboard.
In photoshop you'll want to select all, then choose "free transform" from the edit menu. Hold down command and mouse over the corner. You should be able to grab each corner and drag it until the edges of your sign run parallel to your guides. If you're lucky, you can get it perfect, but it's just important that you get close.
Images below show before, during, and after.
Remember to adjust your levels and make sure the photo is as close to accurate exposure-wise a possible.
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