Python + cv2 exercises to resize jpg and save in bmp

Python + cv2 exercises to resize jpg and save in bmp, tested on Raspberry Pi 5/64 bit Raspberry Pi OS (bookworm).

py_cv_resize.py, resize jpg and save in bmp, the file name is hard-coded in the program. You can also save the image in other file name/format in cv.imwrite() interface.

# Python exercise to resize jpg and save in bmp
# tested on Raspberry Pi 5/64 bit Raspberry Pi OS (bookworm)
import cv2 as cv

target_width = 240
target_height = 240

path = "./images/"
file = "05"
ext_jpg = ".jpg"
ext_bmp = ".bmp"

img = cv.imread(path + file + ext_jpg)
img = cv.resize(img, (target_width, target_height))
cv.imwrite(path + file + ext_bmp, img)

cv.imshow("img", img)
cv.waitKey(0)
cv.destoryAllWindows()

py_cv_batch_resize.py, resize in batch.
It's used to prepare bmp images in my next "Adafruit_GFX/ImageReader exercises to load bmp images from MicroSD and display on 240×320 ST7789 SPI TFT, run on Seeed Studio XIAO ESP32S3 Sense (Arduino Platform)".

# Python exercise to batch resize jpg(s) and save in bmp(s)
# tested on Raspberry Pi 5/64 bit Raspberry Pi OS (bookworm)
import cv2 as cv
import glob
import os

target_width = 240
target_height = 240

src_dir = "./images"
target_subdir = src_dir + "_" + str(target_width)
print(target_subdir)

jpgfiles = []

print("Create directory:", target_subdir, "if not exist")
try:
    os.mkdir(target_subdir)
    print(target_subdir + " created")
except FileExistsError:
    print(target_subdir + " existed")
    
for srcfile in glob.glob(src_dir + "/*.jpg"):
    jpgfiles.append(srcfile)
    print(type(srcfile), srcfile)
    
    head, tail = os.path.split(srcfile)

    dest_file = head+"_" + str(target_width) + "/" + tail[:-3] + "bmp"   # save as ./images_240/*.bmp"
    print(dest_file)
    
    img = cv.imread(srcfile)
    img = cv.resize(img, (target_width, target_height))
    cv.imwrite(dest_file, img)

Related:
~ Install OpenCV & matplotlib on Raspberry Pi OS (Bookworm)