Convert PNG to 565 Format

[britesc]

Hi,
I have tried various ways, but cannot compile the pngto565 converter.
I am using ubuntu 22.04 and eventually got round to installing the libpng-dev package as I needed the header files. Even so, the program stoically refuses to compile.
Any advice please on how I should proceed.
I need to make a small image and some icons.
Thank you.
jB

[antirez]

Please post the compilation error. Thanks. Salvatore Sanfilippo "My task is not difficult; all I would need is to be immortal to accomplish it." -- Jorge Luis Borges.

…

On Mon, 19 Aug 2024 at 14:24, britesc ***@***.***> wrote: Hi, I have tried various ways, but cannot compile the pngto565 converter. I am using ubuntu 22.04 and eventually got round to installing the libpng-dev package as I needed the header files. Even so, the program stoically refuses to compile. Any advice please on how I should proceed. I need to make a small image and some icons. Thank you. jB — Reply to this email directly, view it on GitHub <#1>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAQAYB5QH5435W7TFDIDI3ZSHPZPAVCNFSM6AAAAABMXW7W7KVHI2DSMVQWIX3LMV43ASLTON2WKOZSGQ3TGMRTGI2TKMA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[britesc]

Also if anyone could convert a couple of small images to 565 format that would also be great.
Thank you.

[britesc]

Typical Ubuntu VM just crashed.

[britesc]

error.txt

[britesc]

I must admit that you lib is the smallest and best I can find for display using a Pi Pico W.
And I have searched a lot.
I have come across a couple of glitches with text output as you .md examples don't appear to match the API, particularly wit regard to text functions. But I cab work round that but really need to display a couple of images.
Also create a scrolling menu area...

[britesc]

LCD Connection to Raspberry Pi Pico W
Waveshre Pico LCD 2" using ST7789V https://www.waveshare.com/wiki/2inch_LCD_Module

LCD Pico

---

VCC = VSYS
GND = GND
DIN = GP11
MOSI = 11
CLK = GP10
SCK = 10
CS = 9
DC = 8
RST = 12
BL = 13

HEIGHT = 320
WIDTH = 240

display = st7789_ext.ST7789(
SPI(1, baudrate=40000000, phase=0, polarity=1),
HEIGHT, WIDTH,
reset=Pin(RST, Pin.OUT),
dc=Pin(DC, Pin.OUT),
cs=Pin(CS, Pin.OUT, value=1),
)

display.init(landscape=True,mirror_y=True ,inversion=True)
backlight = Pin(BL,Pin.OUT)
backlight.off()

[britesc]

Hi,
I really need your program to convert the images I have to your 565 format.
I have tried various online converters but they do not give the same leena.565 output.
Thanks really appreciate any help.

[britesc]

By the looks of it the png.h is not the same as the png.h you may be using.
Could you please tell me where to get your version from.
Thanks

[antirez]

Hi @britesc and sorry for the late reply. Probably PNG library mismatch? I can't look into it right now but if you copy&paste the code into some GPT it will be able to convert it in Python without problems. Then you can use the Python version.

[britesc]

Thanks for the reply. I managed to compile the code on an earlier Ubuntu VM and just run up the VM when I have a batch images to convert. Thanks for a great library suits my limited memory space perfectly. Kind regards, jB Sent from Outlook for Android<https://aka.ms/AAb9ysg>

…

________________________________ From: Salvatore Sanfilippo ***@***.***> Sent: Tuesday, March 25, 2025 1:29:25 PM To: antirez/ST77xx-pure-MP ***@***.***> Cc: britesc ***@***.***>; Mention ***@***.***> Subject: Re: [antirez/ST77xx-pure-MP] Convert PNG to 565 Format (Issue #1) Hi @britesc<https://github.com/britesc> and sorry for the late reply. Probably PNG library mismatch? I can't look into it right now but if you copy&paste the code into some GPT it will be able to convert it in Python without problems. Then you can use the Python version. — Reply to this email directly, view it on GitHub<#1 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAMQSL72HQH2MMRAW56Z35L2WE4ZLAVCNFSM6AAAAABMXW7W7KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONJRGA4TQMJYGM>. You are receiving this because you were mentioned.Message ID: ***@***.***> [antirez]antirez left a comment (antirez/ST77xx-pure-MP#1)<#1 (comment)> Hi @britesc<https://github.com/britesc> and sorry for the late reply. Probably PNG library mismatch? I can't look into it right now but if you copy&paste the code into some GPT it will be able to convert it in Python without problems. Then you can use the Python version. — Reply to this email directly, view it on GitHub<#1 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAMQSL72HQH2MMRAW56Z35L2WE4ZLAVCNFSM6AAAAABMXW7W7KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDONJRGA4TQMJYGM>. You are receiving this because you were mentioned.Message ID: ***@***.***>