PIL：在图像底部中间添加文本

Question

I've width and height of the image.

img = Image.open(img_src)
width, height = img.size

font = ImageFont.truetype("MuseoSansCyrl_0.otf", 100)
text_w, text_h = draw.textsize(title, font)

I'm trying to find a generic way to add a text to image at the bottom middle.

Here is the function I've wrote:

def process_img(img_src, title, background):

    img = Image.open(img_src, 'r')
    draw = ImageDraw.Draw(img)
    w, h = img.size

    font = ImageFont.truetype("MuseoSansCyrl_0.otf", 100)
    text_w, text_h = draw.textsize(title, font)

    draw.text((REQ_WIDTH, REQ_HEIGHT), title, (255,255,255), font=font)

    img.save(img_src)

    return img_src

Is there any way I can get the REQ_WIDTH and REQ_HEIGHT ?

Answer 1

You had already placed a call to draw.textsize , which returns you the Width and Height the final text will have - from that point, you just thave to calculate the top-left corner where to render your text like this:

Top will be your image_height - text_height, left will be your image_width/2 - text_width / 2 - thus, your rendering call becomes simply:

draw.text(((w - text_w) // 2, h - text_h), title, (255,255,255), font=font)

(Note that draw.text includes an optional "anchor" argument - but the possible values for it are not documented, nor the documentation states whether it is actually implemented. If it is implemented, and there is a value that represents (horizontal_center, bottom) as the Anchor, you should only have to pass the image_width / 2 and image_height, without needing to call draw.textsize )

Answer 2

The names you have for the needed variables — REQ_WIDTH and REQ_HEIGHT — are a little misleading because they're not a width and height.

You just need to do a little math:

    X_POS = h - text_h
    Y_POS = w//2 - text_w//2  # or (w - text_w) // 2

    draw.text((X_POS, Y_POS), title, (255,255,255), font=font)