Is it possible to generate or simulate italic text for any font other than an original italic font?

What you're talking about is known as 'fake italics' - slanting text instead of using a properly designed italic font. Pillow doesn't offer that functionality, no, and I'm unable to find anything that says that FreeType supports it.

Unless you're talking about variation fonts, where multiple styles are contained within a single font file. That is supported by Pillow - https://pillow.readthedocs.io/en/stable/releasenotes/6.1.0.html#variation-fonts

Check below effect, some words slanted to right, some to left. Some normal.

I know what italics looks like, yes. I'm saying that no, Pillow can't generate italics if the font is not italic (unless you have a variable font), and I can't find any evidence to say that FreeType (a dependency that Pillow uses to render text) does either.

Any method to transform, like wavy?

I found the following answer on StackOverflow: https://stackoverflow.com/a/51701378/1648883

The (now removed) getsize function there is used incorrectly, the following is a corrected version:

def generate_text(text):
    fnt = ImageFont.truetype('arial.ttf', 72)
    mask = fnt.getmask(text, mode='1')
    img = Image.new('1', mask.size)
    img.putdata([x for x in mask])
    img = img.convert('RGB')
    return img

def add_border(img, width):
    new = Image.new('RGB', (img.width + 2 * width, img.height), (0, 0, 0))
    new.paste(img, (width, 0))
    return new

def shear(img, shear):
    shear = img.transform(img.size, Image.AFFINE, (1, shear, 0, 0, 1, 0))
    return shear

img = generate_text('test')
img = add_border(img, 200)
img = shear(img, 2)

Thank you.
Which parameter to control direction and angle?

The shear argument to shear().

So shear(img, 2) with FreeMono.ttf gives

shear(img, 1) gives

shear(img, -1) gives

it looks good. Thank you.

Is it possible to use ImageFont.FreeTypeFontFamily for above function?

Oh, your problem is that FreeTypeFontFamily doesn't have getmask.

It should just be a matter of replacing

fnt = ImageFont.truetype('arial.ttf', 72)
mask = fnt.getmask(text, mode='1')

with

arial_fnt = ImageFont.truetype('arial.ttf', 72)
fnt = ImageFont.FreeTypeFontFamily(arial_fnt)
mask = fnt.getmask2(text, mode='1')[0]

in your code.

But again - you use #6926 at your own risk, as it has not been finished yet.

I tried your code, there is below error.

   mask = fnt .getmask(text, mode='1')[0]
AttributeError: 'FreeTypeFontFamily' object has no attribute 'getmask'

getmask2

Ok. It works now. Thank you.

Thank you.

Can bold font be realized with similar method above? Any parameters to adjust?

I also want to add background color for some random text, how to realize it with pillow?

Can bold font be realized with similar method above? Any parameters to adjust?

Without a bold font or a variation font, no, Pillow can't do this, and I don't think Freetype can either.

Can bold font be realized with similar method above? Any parameters to adjust?

Without a bold font or a variation font, no, Pillow can't do this, and I don't think Freetype can either.

Any fast method like opencv's erode, dilate to simulate bold?

I used pixel color replace to simulate highlight, it may be slow? Any fast method?

Below seems working, any improvements needed?

def shear(img, shear):
    shear = img.transform(img.size, Image.AFFINE, (1, shear, 0, 0, 1, 0))
    new = Image.new('RGB', (img.width, img.height), "#fff") # 白底

    new1 = Image.new('RGBA', (500, img.height), "#f00") # 白底
    new.paste(new1 , (0, 0), new1 )

    new.paste(shear, (0, 0), shear)
    return new

Any fast method like opencv's erode, dilate to simulate bold?

Something like MaxFilter might work:
https://pillow.readthedocs.io/en/stable/reference/ImageFilter.html#PIL.ImageFilter.MaxFilter

I also want to add background color for some random text, how to realize it with pillow?

You can add a background by using my answer on StackOverflow: https://stackoverflow.com/a/72302587/1648883

thank you, will try

Closing this issue as no feedback has been received.

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Is it possible to generate or simulate italic text for any font other than an original italic font? #7292

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Is it possible to generate or simulate italic text for any font other than an original italic font? #7292

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radarhere commented on Jul 19, 2023

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